Symptoms
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When sending an email from Plesk to an external server, the email is stuck in the outgoing queue or fails to be sent with the following bounce message:
MailEnable: Message could not be delivered to some recipients.
The following recipient(s) could not be reached:
Recipient: [SMTP:<username>@gmail.com]
Reason: The message could not be delivered because the domain name (gmail.com) does not appear to exist. -
One of the following messages is logged in
C:Program Files (x86)Mail EnableLoggingSMTPSMTP-Debug-<datetime>.log:ME-E0124: Error (1460): Could not resolve MX list for domain [example.com]
ME-E0042: - SMTP Connection DNS Server could not resolve domain name (example.com) in a timely fashion. Check DNS Server settings.
ME-E0042: [71F2BE266CCF446CA0B9225A0DD2D496.MAI] - SMTP Connection DNS Server could not resolve domain name (example.com) in a timely fashion. Check DNS Server settings.
ME-E0059: [71F2BE266CCF446CA0B9225A0DD2D496.MAI] Message Delivery Failure. Attempt (0): Could not connect to mail server for domain (example.com). The remote mail server could not be contacted at this time. Message has been requeued. -
The recipient's domain name example.com can be resolved externally. For instance:
C:> nslookup example.com
Address: 203.0.113.2and its MX record can be verified as described in this article.
Cause
Local DNS resolver fails to resolve the domain name of the recipient.
Resolution
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Connect to the Plesk server via RDP.
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Start MailEnable console at Windows Start > All Programs > MailEnable.
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In MailEnable console, expand Servers > localhost > Services and Connectors > right-click on SMTP > Properties.
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On the General tab, specify DNS IP addresses in the DNS addresses field. For example, Google DNS
8.8.8.8or4.4.4.4: -
Click OK to apply the changes.
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Restart SMTP server to apply changes: right click on SMTP > Stop > then Start.
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Try to send an email again.
If the issue still persists, set up DNS resolver in Windows Networking settings:
with