G-Lock Email Verifier: Common Errors and Troubleshooting Tips

When you verify email addresses using a direct Internet connection mode or web script, the verification returns the following statuses:

New – status 0

Good – status 1

Bad – status 2

Unknown – status 3

Timeout – status 4

GreyListed – status 5

Each of the statuses is linked to a server response which is shown in the LastResponse column. You can also see the full log of the email address in the Log panel. Select a line with the email address and a full log for this email address is displayed in the Log panel.

List of Common Responses

The following server responses are given when you verify emails using a direct Internet connection mode, web script or socks proxy servers.

If you verify emails through BPSocks email validation API, see the statuses and responses given by the API in this “How to Use Email Validation API” PDF Guide


Verification result: New


Result set by Rule
The program skipped the email address according to the rule. Go to Settings -> Rules to see the rules. You can read more about the email validation rules here.


Verification result: Bad


550 RCPT TO: <xxxx@domain.com> User unknown
Such user does not exist.


550 <xxxx@domain.com> No such user
Such user does not exist.


550 5.1.1 unknown or illegal alias: <xxxx@domain.com>
Such user does not exist.


550 Invalid recipient:
The recipient's mail server returned the response that the user's email address was bad.


550 recipient rejected
The recipient's mail server returned the response that the user's email address was bad.


501 #5.1.1 bad address <xxxx@domain.com>
The recipient's mail server returned the response that the user's email address was bad.


550 5.2.1 <xxxx@domain.com> Mailbox disabled for this recipient
The mailbox for this recipient is not available anymore.


550 Mailbox is inactive
The mailbox for this recipient is not available anymore.


550 Mailbox unavailable or access denied – <xxxx@domain.com>
The mailbox for this recipient is not available anymore.


Working MX record for domain xxxx.com is not found.
There are no MX records for the recipient's mail server in the DNS server.


Result set by Rule
The program did not verify the email address and automatically marked it as “Bad” according to the rule. Go to Settings -> Rules to see the rules. You can read more about the email validation rules here.


Verification result: Unknown


10060: Connection timed out
Most likely your ISP blocks the port 25 and does not allow you verify emails in the direct connection mode. Click on Settings, then click on the Connection tab in the Settings. Check the "Direct internet connection" option and click Test. If the test fails, you won't be able to use the direct connection mode. Consider using an alternate email verification method, for example, through the web script. If you know that your ISP does not block the port 25 but the direct connection test fails, make sure that you added Advanced E-mail Verifier (the aev.exe file) to the list of allowed programs in your firewall settings.


550 ERROR: Mail Refused
The IP address of the computer where the Advanced Email Verifier is installed is blacklisted.


553 Not delivered: Sender's IP blacklisted by njabl.org.
The IP address of the computer where the Advanced Email Verifier is installed is blacklisted.


554 combined.njabl.org blocked
The IP address of the computer where the Advanced Email Verifier is installed is blacklisted.


421 4.7.1 Rejected: listed as spam source at ZEN http://www.spamhaus.org/query/bl?ip=xx.xxx.xx.xxx
The IP address of the computer where the Advanced Email Verifier is installed is blacklisted. All ISP’s report their dynamic ranges to spamhaus. Anyone using the zen spamhaus list automatically blocks all email from dynamic IP addresses.


553 sorry, your mailserver [xx.xxx.xx.xxx] is rejected by Barracuda – http://www.barracudacentral.org/
The connection from the IP address of the computer where the Advanced Email Verifier is installed is rejected by Barracuda for security reasons.


554- (RTR:DU) http://postmaster.info.aol.com/errors/554rtrdu.html
The connection from the IP address of the computer where the Advanced Email Verifier is installed is rejected because the recipient’s mail server uses the Spamhaus PBL to block mail from dynamic and residential IP addresses.


554 Relaying denied. IP name lookup failed for xx.xxx.xxx.xx
Your IP address is blacklisted. AEV imitates sending a message from your computer to the recipient's mail server. SMTP servers can have anti-spam filters that refer to DNSBL lists to check the sender's IP address and if the IP address is blacklisted, the email is rejected. If you used the direct connection mode, consider using an alternate email verification method, for example, through the web script or email verification API.


550 Dynamic IPs/open relays blocked
The mail server doesn't accept connections from dynamic IP addresses or open relays. If you used the direct connection mode, consider using an alternate email verification method, for example, through the web script or email verification API.


451 Can't connect to <xxxx@domain.com> – psmtp
AEV was unable to connect to the recipient's mail server at that time. Re-check the email addresses with this error later (in 5-10 min).


451 First-time sender tempfailed as anti-spam measure; please try again
To prevent spam, the mail server refuses the first connection. It is assumed that spammers don't try to send an email twice. Re-check the email addresses with such error later (in 5-10 min).


421 Service not available, closing transmission channel
Advanced Email Verifier was unable to connect to the recipient's mail server at that time.

1) Re-check the email addresses with this error later.

2) Switch the real time scanning of outgoing emails to OFF in your anti-virus software.


URL: http://www.yourdomain.com/aev7.php
Unable to parse response from script
Error. The password your entered is incorrect.
The error occurs because you verify emails through the script taken from a different computer. Go o the Advanced Email Verifier Settings -> Connection, click “Get Script” and re-upload the aev7.php file to your web server. Re-check email addresses.


Result set by Rule
The program did not verify the email address and automatically marked it as “Unknown” according to the rule. Go to Settings -> Rules to see the rules. You can read more about the email validation rules here.


Verification result: Timeout


10060: Connection timed out
The recipient's mail server didn't respond within the specified period of time (Timeout) and the AEV broke the connection to it. Increase the Timeout (Home menu -> Timeout) and verify the address later. If the address is still marked as Timeout, send an email to it. If the email bounces, the address is not valid.


Verification result: GreyListed


421 Message from [xx.xxx.xxx.xx] temporarily deferred – 4.16.50
The recipient’s mail server uses the “greylisting” technology and doesn’t accept the first connection due to security reasons.


450 4.2.0 <...>: Recipient address rejected: greylisted – wait some time and try again
Open the Advanced Email Verifier Settings (General) and check the "Recheck GreyListed emails in one session" option. Or, wait for 5-10 min and re-check GreyListed emails manually (Start -> Verify email addresses -> GreyListed).