Article ID: 119838, created on Jan 28, 2014, last review on Jun 7, 2014

  • Applies to:
  • Plesk 11.5 for Linux
  • Plesk 11.0 for Windows
  • Plesk 11.5 for Windows


Mail delivery freezes. Mail cannot be delivered. How to troubleshoot?


Make sure that:

  1. SMTP service as well as other Mail services are running.

  2. SMTP port 25 should not be blocked by firewall.

  3. IP address of DNS server is set correctly in "Mailenable Management>Servers>Localhost>Connectors>SMTP>Properties->dns servers".

  4. Mail queue is not full.

If you use Mailenable, make sure that mail queues are not full:

C:\Program Files\Parallels\Plesk\Mail Servers\Mail Enable\Queues\SMTP\Outgoing

C:\Program Files\Parallels\Plesk\Mail Servers\Mail Enable\Queues\SMTP\Inbound

Apply Mailenable solutions to deleting mails if it is nessesary:

How to manually delete Outbound SMTP messages from MailEnable queues?

How to clear the queues if a spammer abuses the server?

5.Check mail logs in C:\Program Files\Parallels\Plesk\Mail Servers\Mail Enable\Logging\SMTP

6.Check spam folder, mail can be recognized as spam.

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