Posts Tagged ‘EasyMail7’

How to Use Gmail’s SMTP Settings in EasyMail7

How to Use Gmail’s SMTP Settings in EasyMail7 to Send Emails


Like Yahoo, Gmail allows you to send emails through their SMTP server. Because of the Gmail’s sending limitation to 100 emails per day, you can use the Gmail’s SMTP server if you have a small list of email subscribers or if you want to test how EasyMail7 is sending emails through the 3rd party server.

Follow the steps below to connect EasyMail7 with your Gmail email account.

Step 1. Allow Access to Your Gmail Email Account.

Before you can start sending email, there is one important thing you have to do for successful integration of the Gmail’s SMTP server with EasyMail7.

Gmail is protecting your email account from unauthorized access and is not allowing other applications to connect to it.

So, in order EasyMail7 can use your Gmail email account for sending emails, you need to turn the access to On.

To do this, login to your Gmail email account in the browser.

Go to the Settings.

How to Use Gmail's SMTP Settings in EasyMail7

Go to “Accounts and Import” and click “Other Google Account Settings”.

How to Use Gmail's SMTP Settings in EasyMail7

Click “Signing in to Google”.

How to Use Gmail's SMTP Settings in EasyMail7

Turn the “2-Step Verification” to OFF.

How to Use Gmail's SMTP Settings in EasyMail7

Scroll the page down and turn the “Allow less secure apps:” option to ON.

How to Use Gmail's SMTP Settings in EasyMail7

That’s all with the settings in your Gmail account.

Now you can go to the Step 2 and connect EasyMail7 with the Gmail SMTP server.

Step 2. Configure EasyMail7 to Use the Gmail’s SMTP.

Start EasyMail7 and go to Settings -> Email Accounts.

Click “Add New”.

Enter the account name and your “From” name.

Enter your Gmail email address as the “From” email address, “Bounce (return)” email address and “Reply” email address under the General tab.

Set the limitation 100 emails per day and 1 SMTP connection to comply with the Gmail’s sending restrictions.

How to Use Gmail's SMTP Settings in EasyMail7

Then click on the “Delivery Options” tab.

Choose the “Send via SMTP Server” delivery mode and then choose Gmail from the list of pre-defined SMTP.

How to Use Gmail's SMTP Settings in EasyMail7

EasyMail7 will fill in the SMTP server (smtp.gmail.com), port (587), and security protocol (STARTTLS).

Now check the “My server requires authentication” option and enter your Gmail account login username (your full Gmail email address) and password.

Click “Test” to test the SMTP settings.

If you receive a test email from EasyMail7, everything is good and you are done. If not, double check if your settings are correct.

Click OK to save the account settings in EasyMail7.

How to Use Gmail's SMTP Settings in EasyMail7

Step 3. Configure Bounce Handling in EasyMail7.

There is one more important thing you need to do — configure bounce handling to suppress bounced and complaining users from your mailing list and maintain a good sender reputation.

Follow these steps:

Return to the main EasyMail7 window.

Click on “Bounce Handler” at the left pane.

Create an account in the Bounce Handler with the following settings:

Account Type: IMAP
Server: imap.gmail.com
Port: 143
Security protocol: Default (no SSL)
Login: your Gmail email address
Password: password for your Gmail email account

Click “Retrieve” and wait for a while.

Then click on three dots in the “IMAP Folder” menu and select the Gmail folder from which the system will retrieve bounced emails. Usually, bounces come to the Inbox.

Also, set other actions and options that will be applied to bounced emails and click OK to save the account.

How to Use Gmail SMTP Settings in EasyMail7

Now you can manually start the account check in the Bounce Handler after each broadcast to get your bounced emails handled and deleted/unsubscribed in your contact groups. Or, you can then go to the bounced account settings and check the option to automatically check your account and process bounces every hour.

Here you can read more about bounce handling in EasyMail7

How to Use Elastic Email’s SMTP Settings in EasyMail7

How to Use Elastic Email’s SMTP Settings in EasyMail7 to Send Email Newsletters


You can connect EasyMail7 with any SMTP server or SMTP relay service to send emails as per your requirement.

Here we guide you through the steps how to connect EasyMail7 with Elastic Email.

Step 1. Create Account with Elastic Email.

If you don’t have an account with Elastic Email yet, follow the steps below to create it.

Go to the Elastic Email’s website and click “Signup”.

Enter your email address, password, industry and click “Create”.

Then enter the captcha text and submit.

You will be sent an email with the account activation link.

Check your mailbox and click the link to activate your account on Elastic Email.

Step 2. Configure Your Elastic Email Account.

Before you can start sending emails via the Elastic Email’s SMTP, you need to do some important settings in your account.

First, you need to add and verify your sending domain with Elastic Email.

After you activate your account on Elastic Email, login to it.

Go to the account Settings.

How to Use Elastic Email's SMTP Settings in EasyMail7

Go to “Domains”.

Click “Add Domain”.

How to Use Elastic Email's SMTP Settings in EasyMail7

Enter your sending domain and add it.

Then follow the guidance here to add the SPF and DKIM authentication to your sending domain.

When added, click “Verify”.

How to Use Elastic Email's SMTP Settings in EasyMail7

If the authentication records are added correctly, you will see the checkmarks in the appropriate boxes.

Now go to the “Sending” tab and make these settings:

1. Check the “Return Bounces” option.

2. Enter your email address destined to receive bounce emails. If you don’t have a separate email address for bounces, enter the email address that you will use to send emails from.

This setting will allow Elastic Email to forward your bounce messages to you in order you can handle them with the EasyMail7’s Bounce Handler.

3. Turn the “Track Clicks” option to Off. It is the recommended setting. Tracking links from generic domains used by email service providers and SMTP gateway services like Elastic Email often get on different blacklists because they are used by all service users.

If you want to track email opens and clicks without losing in deliverability, you can use an email tracking service like G-Lock Analytics that allows you to use a custom domain for tracking links.

4. Check the “Auto Create Text Body” option.

5. Select the “QuotedPrintable” content transfer encoding type.

6. Click “Save”.

How to Use Elastic Email's SMTP Settings in EasyMail7

Next, go to the “SMTP/API” tab.

Notice the data in the “SMTP Configuration” section. You have to use these SMTP credentials in EasyMail7.

How to Use Elastic Email's SMTP Settings in EasyMail7

Step 3. Configure EasyMail7 to Use the Elastic Email’s SMTP.

Start EasyMail7 and go to Settings -> Email Accounts.

Click “Add New”.

Enter the account name, “From name”, “From” email address, “Bounce (return)” email address and “Reply” email address under the General tab.

Note: as the “Bounce (return)” email address enter your bounce email address that you entered in your Elastic Email account to forward bounces to.

How to Use Elastic Email's SMTP Settings in EasyMail7

Then go to the “Delivery Options”.

Choose the “Send via SMTP Server” delivery mode and enter the SMTP credentials from Elastic Email:

SMTP server: smtp.elasticemail.com
Port: 2525
Security protocol: Default (No SSL)
My server requires authentication: Yes
Login: your User name from the SMTP Configuration settings on Elastic Email
Password: your password from the SMTP Configuration settings on Elastic Email

Click “Test” to test the SMTP settings.

If you receive a test email from EasyMail7, everything is good and you are done. If not, double check if your settings are correct.

Click OK to save the account settings in EasyMail7.

How to Use Elastic Email's SMTP Settings in EasyMail7

Step 3. Configure Bounce Handling in EasyMail7.

There is one more important thing you need to do — configure bounce handling to suppress bounced email addresses from your mailing list and maintain a good sender reputation.

You’ve already set up the forwarding of bounce messages to your bounce email address in Elastic Email.

Now you need to set up bounce handling in EasyMail:

Follow these steps:

Return to the main EasyMail7 window.

Click on “Bounce Handler” at the left pane.

Create an account in the Bounce Handler with your incoming mail server settings.

Note: in the Login field, enter your “Bounce” email address to which your bounce email messages will be forwarded by Elastic Email.

How to Use Yahoo SMTP Settings in EasyMail7

Also, set other actions and options that will be applied to bounced emails and click OK to save the account.

Now you can manually start the account check in the Bounce Handler after each broadcast to get your bounced emails handled and deleted/unsubscribed in your contact groups. Or, you can then go to the bounced account settings and check the option to automatically check your account and process bounces every hour.

Here you can read more about bounce handling in EasyMail7

How to Use Yahoo’s SMTP Settings in EasyMail7

How to Use Yahoo’s SMTP Settings in EasyMail7 to Send Email Newsletters


Yahoo is a very popular mailbox provider that allows you to send emails through their SMTP server. And you can certainly do it after connecting your Yahoo email account with EasyMail7.

This tutorial guides you through the steps how to configure EasyMail7 to use the Yahoo SMTP settings.

Step 1. Allow Access to Your Yahoo Email Account.

There is one important thing which has to be done for successful integration of the Yahoo SMTP server with EasyMail7.

Yahoo is protecting your email account from unauthorized access and is not allowing other applications to connect to it.

So, in order EasyMail7 can use your Yahoo email account for sending emails, you need to turn the access to On.

To do this, login to your Yahoo email account in the browser.

Go to the “Account Info”.

How to Use Yahoo SMTP Settings in EasyMail7

Click on the “Account Security” tab.

Turn the “Allow apps that use less secure sign-in” option to On.

How to Use Yahoo SMTP Settings in EasyMail7

Go to the Steps 2.

Step 2. Configure EasyMail7 to Use the Yahoo’s SMTP.

Start EasyMail7 and go to Settings -> Email Accounts.

Click “Add New”.

Enter the account name and your “From” name.

Enter your Yahoo email address as the “From” email address, “Bounce (return)” email address and “Reply” email address under the General tab.

Set the limitation 100 emails per hour and 1 SMTP connection to comply with the Yahoo’s sending restrictions.

How to Use Yahoo SMTP Settings in EasyMail7

Then click on the “Delivery Options” tab.

Choose the “Send via SMTP Server” delivery mode and then choose Yahoo from the list of pre-defined SMTP.

How to Use Yahoo SMTP Settings in EasyMail7

EasyMail7 will fill in the SMTP server (smtp.mail.yahoo.com), port (587), and security protocol (STARTTLS).

Now check the “My server requires authentication” option and enter your Yahoo account login username and password.

Click “Test” to test the SMTP settings.

If you receive a test email from EasyMail7, everything is good and you are done. If not, double check if your settings are correct.

Click OK to save the account settings in EasyMail7.

How to Use Yahoo SMTP Settings in EasyMail7

Step 3. Configure Bounce Handling in EasyMail7.

There is one more important thing you need to do — configure bounce handling to suppress bounced and complaining users from your mailing list and maintain a good sender reputation.

Follow these steps:

Return to the main EasyMail7 window.

Click on “Bounce Handler” at the left pane.

Create an account in the Bounce Handler with the following settings:

Account Type: IMAP
Server: imap.mail.yahoo.com
Port: 993
Security protocol: STARTTLS
Login: your Yahoo email address
Password: password for your Yahoo email account

Click “Retrieve” and wait for a while.

Then click on three dots in the “IMAP Folder” menu and select the Yahoo folder from which the system will retrieve bounced emails. usually, bounces come to the Inbox.

Also, set other actions and options that will be applied to bounced emails and click OK to save the account.

How to Use Yahoo SMTP Settings in EasyMail7

Now you can manually start the account check in the Bounce Handler after each broadcast to get your bounced emails handled and deleted/unsubscribed in your contact groups. Or, you can then go to the bounced account settings and check the option to automatically check your account and process bounces every hour.

Here you can read more about bounce handling in EasyMail7

Use Mailgun SMTP Settings in EasyMail7

How to Use Mailgun SMTP Settings in EasyMail7 to Send Email Newsletters

G-Lock EasyMail7 works perfectly with any third party SMTP server and delivery service like Amazon SES, SendGrid, Mailjet, Mailgun and others.

This tutorial guides you through the steps how to configure EasyMail7 to use the Mailgun’s SMTP settings to send your email newsletters in style.

The tutorial assumes that you have already installed and activated either the trial or licensed version of EasyMail7.

Configuration of EasyMail7 with Mailgun SMTP

Step 1. Add and Verify Domain with Mailgun.

If you don’t have an account with Mailgun yet, you can create a free account here.

The free account allows you to send the first 10,000 emails every month for free.

After you signup, login to your Mailgun account and go to Domains.

There, click on "Add New Domain".

Get Mailgun SMTP credentials

Type in your domain that you will use to send emails from and click “Add Domain”.

Get Mailgun SMTP credentials

Perform 5 steps to verify your domain with Mailgun.

Get Mailgun SMTP credentials

Then wait for your domain to be verified.

Once you make the required DNS changes it can take 24-48hrs for those changes to propagate. Mailgun will email you to let you know once your domain is verified.

Step 2. Get Mailgun SMTP Credentials.

Once your domain is verified, it will acquire the status “Active” in your Mailgun account dashboard.

Click on the domain to get the SMTP credentials.

The credentials you need are: SMTP Hostname, Default SMTP Login and Default Password.

Get Mailgun SMTP credentials

Step 3. Enter Mailgun SMTP Credentials in EasyMail7.

Start EasyMail7 and go to Settings -> Email Accounts.

Click “Add New”.

Enter the account name, your “From” name, “From” email address, “Bounce (return)” email address and “Reply” email address under the General tab.

Then click on the “Delivery Options” tab.

Choose the “Send via SMTP Server” delivery mode and enter the SMTP credentials you’ve got from Mailgun:

SMTP Server: smtp.mailgun.com

My server requires authentication: checked

Login: your Default SMTP Login ([email protected])

Password: your Default Password

Also, choose the Security protocol Default (No SSL) and enter the port 25.

Get Mailgun SMTP credentials

Click “Test” to test the SMTP settings.

If you receive a test email from EasyMail7, everything is good and you are done. If not, double check if your settings are correct.

How to Track Bounce Emails from Mailgun

Mailgun does not forward bounce emails to your Return email address. Thus, you need to use a separate tool for bounce email processing. You can use the GlockApps spam testing tool to track bounce emails using Mailgun’s webhooks.

The GlockApps Bounce Monitor provides real-time analytics about your bounce messages. It collects bounce emails and shows you the bounce error code and reason so that you can see why the email bounced: hard or soft bounce, block or complaint.

It differentiates bounces by the sender email address, sender domain and provider. It also shows you a graphic diagram in order you can see spikes in your bounce rate over time.

GlockApps will provide you with bounce email reports that you can download and load into G-Lock EasyMail7’s Global Exclusion List to exclude bounce emails from your email campaigns.

Read also: How to Track Mailgun Bounces with GlockApps

Why MailChimp Suspended My Account

Why MailChimp Suspended My Account

MailChimp is known to work with an abuse-prevention system to make sure their infrastructure stays healthy and free of activity that violates the CAN-SPAM Act or their Terms.

So, if their abuse-prevention system or human team notices that something about your account or email campaigns raised a red flag, you will find your account suspended by MailChimp.

Below is a list of factors that could cause a red flag with MailChimp:

How to Add Facebook, LinkedIn and Twitter Links to the Email

How to Add Facebook, LinkedIn and Twitter Links to the Email

The popularity of social networks is slowly but surely surpassing old-school means of communication. As a result, it is becoming quite normal to have your own or your company’s links to Facebook, Twitter, LinkedIn and other social media profiles in the email signature or footer.

It is easy to link to your Facebook, Twitter or LinkedIn page from the message in G-Lock EasyMail7. Just follow the steps below:

Open G-Lock EasyMail7, login and go to Settings –> Workplace Settings.

G-Lock EasyMail7 workplace settings

In the Workplace Settings enter the links to your social profiles and click OK.

G-Lock EasyMail7 workplace settings

Create a new message or pick up one your email templates.

Put the mouse in the footer or signature where you want to add a link to your social page, for example, on Facebook.

Click on the Merge menu and choose the “Friend on Facebook” menu item.

You can have your custom anchor text and use a catchy phrase like “Join Our Fan Page on Facebook”.

To do this, type your custom text, highlight it, click on the Dymanic Fields menu and choose “Friend on Facebook”.

G-Lock EasyMail7 workplace settings

It is possible to just add a hyperlink to your social page, but a button with the logo of a specific social network looks more professional.

You can perform a Google search for Facebook, Twitter, etc. icons and download them to your computer. Or if you have a graphic designer in your company, you can ask him to create a nice icon for you.

Alternatively, you can use built-in email templates in G-Lock EasyMail7 which already have social networks icons or design a new template using blocks and footer with embedded icons.

To add social networks links to icons, select the icon, for example Facebook, click on the Dynamic Fields menu and choose the “Friend on Facebook” menu item.

G-Lock EasyMail7 workplace settings

The icon will be linked to the Facebook tag:

"tag://%%facebook%%"

During the sending process the tag will be replaced by the actual link from the Workplace Settings.

Social links from the Workplace Settings work for all contact groups.

If you wish, you can enter different social links for different groups. To do this, go to “Contacts”, click on the group name and then click “Edit” on the menu bar.

Click on the “Group Links” tab and enter different links to your social pages that you want to send to contacts in this group.

Group Links have priority and will be used in the first place. If Group Links do not exist, the program will take the links to social pages from the Workplace Settings.

G-Lock EasyMail7 workplace settings

How to Automatically Send Reminder

How to Automatically Send Reminder to People Who Clicked Link in the Previous Email

Using automated emails in the EasyMail7 you can send pre-written follow-up emails to your subscribers over time sequentially and automatically after they’ve subscribed to your list. It is an effective way to engage your subscribers and dramatically increase your conversion rate.

But sometimes you may need to send just a single email in response to the recipient’s action, for example, a welcome email, a reminder about an upcoming event, an email with a download link, etc. etc. You can send such an email automatically using an autoresponder in the EasyMail7.

Here is the scenario. For example, you send an email with a call-to-action button to each new subscriber added to your list. The recipient must click on that button if he wants to be sent a reminder via email. The recipient clicks on the button and gets a “thank you” page telling “Thank you. We will send you a reminder about the upcoming event”. The same day or in a particular number of days the autoresponder sends a reminder to people who clicked the call-to-action and asked for the reminder. This scenario can be accomplished using G-Lock Analytics email tracking service and automated emails in the EasyMail7.

Just follow the steps below:

Step 1. Create Account on G-Lock Analytics

G-Lock Analytics is used to track the recipient’s click and report it to the EasyMail7 so that the program knows who clicked the button and must be sent the reminder.

If you already have an account with G-Lock Analytics, skip this step.

If you do not have an account yet, create it now.

Enter your login email address and password under Settings -> Analytics Settings.

Step 2. Create Automated Emails Series

Go to “Autoresponder” and click “New”.

Create a new series:

Email Series Name – enter a name for the email series.

Select Group – select the group the email series will send emails to. Important! You can select only one group at a time.

Date Field – select the field with the date when the subscriber was added to the list.

Send to contacts where [Date Field] is greater than: – check this option and choose the date if you want to send follow-up emails to contacts whose subscribe date is greater than the selected date.

If you don’t check the above option, the series sends the emails to all contacts in the group.

Start sending at: – choose the date when the series will start sending emails.

On what days email messages should be sent: – choose the days when the program will send automated emails.

On what time email messages should be sent: – choose the start time and end time when the program will start and stop sending automated emails.

Click OK.

Create autoresponder in EasyMail7

Now after you created the email series, you can add emails to it. Since the reminder will be sent depending on whether or not the recipient clicked the button in the first message, you have to send the first message using the automated emails series, too. Thus, the series will send two emails: initial email with the call-to-action button and the reminder to the people who clicked the button. 

Step 3. Add Message #1

Click on “Message” on the menu bar and write the message. Add the call-to-action button with a link.

Select the account you will send emails from in the “From” field. 

Click “Send”.

Select “Send by Autoresponder” from the “Send” button menu.

Add email to autoresponder in EasyMail7

In the Message Settings select the email series and set the condition “With delay of xx days (hours) after previous message”. 

When you are setting up the first message, it will be sent in xx days (hours) after the date you selected in the email series settings. To send the message immediately, enter 0 into the days/hours field.

Click OK.

Autoresponder email settings

Step 4. Add Message #2 (Reminder)

Click on “Message” on the menu bar and write the reminder. 

Select the account you will send emails from in the “From” field. 

Click “Send”.

Select “Send by Autoresponder” from the “Send” menu.

In the Message Settings select the email series and set the condition “With delay of xx days (hours) after the selected message if the recipient clicks on any link in it“. Choose 0 days (hours) to send the reminder immediately after the recipient clicks the call-to-action button.

Next select the message #1 and put the check mark next to the link. 

Click OK.

Autoresponder email settings

Turn the messages and the email series to On and leave the computer or server where the EasyMail7 Server is installed turned to On.

The program will send the first email with the call-to-action button to all subscribed contacts in the group and the reminder will be sent to only those contacts who will click the call-to-action button. If you add new subscribers to the group, the program will send the first message to newly added contacts and the reminder to those who will click the button.

How to Increase Sales Even with Tiny List

10 Best Email Marketing Practices to Increase Sales Even with Tiny List

There is no secret that each email marketer is aimed at growing his subscriber base. More subscribers, more sales. It’s true to some degree. But you should not forget that you will pay more to your email service provider as far as your list is growing.

With that in mind, what you should focus on is trying to make more sales from your existing list. Try to get more profit from your current leads instead of relying on new subscribers. I do not want to tell that you should not grow your list at all. Yes, you should, and it’s good if your subscriber base is expanding. I just want to tell that it should not be the priority. The priority is to maximize the profit from your existing email list.

Below are 10 email marketing practices you can utilize to increase sales even with a tiny list:

How to Sign Email with DKIM Signature in G-Lock EasyMail7

How to Sign Email with DKIM Signature in G-Lock EasyMail7


Authentication helps legitimate senders prove that their email isn’t forged, and can help receiving servers like ISPs and corporate email servers control inbound spam. There are a variety of authentication methods: SPF, SenderID, DomainKeys, and DKIM. SPF and SenderID allow a domain owner to add a file or record on the server that the recipient server cross-checks. These are easy to implement, but some suggest they aren’t as secure. DKIM and DomainKeys embed information within the email, making it harder to forge. The DKIM record allows to digitally “sign” your emails for your domain. You can learn more about DKIM here

Starting from the version 7.7 EasyMail7 allows you to add a DKIM signature to your emails.

Follow the steps below to sign email with DKIM signature in EasyMail7:

Step 1. Make key-pair certificate.

First of all, you need to generate a certificate which contains public key/private key. You can use MakeCert.exe (.NET Framework Tools) to generate the certificate. You can download makecert.exe here

If you are on Windows 7 or 8, run Command Prompt as Admin, type the path to the makecert.exe file on the disk and then type

-pe -n "CN=mydomainkeys" -ss my -sr LocalMachine -a sha1 -sky signature -r

Press Enter.

create certificate

If you are on Windows XP, click on Windows Start -> Run.

Type the path to the makecert.exe file on the disk and then type

-pe -n "CN=mydomainkeys" -ss my -sr LocalMachine -a sha1 -sky signature -r

Example:

C:\Users\Julia\Desktop\My Documents\makecert.exe -pe -n "CN=mydomainkeys" -ss my -sr LocalMachine -a sha1 -sky signature -r

Press Enter.

Now click Windows Start -> Run.

Type MMC and press Enter.

Click on File -> Add/Remove Span-in.

create certificate

Choose Certificates and click Add.

create certificate

Select Computer Account -> Local Computer -> Finish.

create certificate

Click OK.

You must see the certificate under Certificates (Local Computer) -> Personal -> Certificates.

Step 2. Export key-pair certificate.

Now export the certificate with MMC.

Click the right mouse button on the certificate and then click All Tasks -> Export.

export certificate

During the export choose Yes, export the private key -> Personal Information Exchange.

export certificate

Type the and confirm the password, type the name for the .pfx file, for example domain.pfx, and finish the export.

Step 3. Configure EasyMail7 to sign email with DKIM signature.

Now open EasyMail7 and login.

Go to Settings -> Email Accounts.

Select an account and click on Edit Account.

Click on DKIM Signature tab.

Check the "Sign email with DKIM Signature" option.

Fill in the fields:

Email sender domain: typically the same domain as the sender of an email.

Domain public key selector: an arbitrary string to identify the matching public key in DNS.

PFX file full path: click "Browse" and choose the .pfx file on the disk.

Important! If the EasyMail7 Client and EasyMail7 Server are installed on different computers, you must place the .pfx file on the Client’s machine.

PFX file password: password you entered during the export of the .pfx file.

Click on the "Generate DNS TXT Record" button.

sign email with DKIM signature in EasyMail7

Add the TXT record with the displayed name and value to your DNS records. Depending on the DNS management service you are using, you may need to add the DNS record name without the domain (example: easymail7._domainkey).

Click OK to save the settings.

After the DNS TXT record is added and verified, EasyMail7 will sign all emails sent from this account with a DKIM signature. To verify it, send a test message to your Gmail or Yahoo email address and view the source of the received message. Look for DKIM-Signature: line in the message header.