Symptoms
-
Unable to send or receive email messages on Plesk server. The following error appears in log fileÂ
/usr/local/psa/var/log/maillog
:NOQUEUE: reject: RCPT from unknown[203.0.113.2]: 454 4.7.1 <[email protected]>: Relay access denied;
/usr/lib64/plesk-9.0/psa-pc-remote[9425]: Message aborted.
/usr/lib64/plesk-9.0/psa-pc-remote[9425]: Message aborted. -
The following error is shown in Horde webmail interface when trying to send an email:
PLESK_INFO: There was an error sending your message: Could not open secure TLS connection to the server
Cause
Mail relay is disabled server-wide / mail service is disabled for specific subscription / the subscription is disabled in Plesk UI.
Resolution
-
Check if mail relay is enabled at  Plesk > Tools & Settings > Mail Server Settings > Relay options and enable it if it is disabled:
-
Make sure that affected subscription is enabled at Plesk > Subscriptions > example.com:
-
Make sure that mail service is enabled for the affected subscription at Plesk > Subscriptions > example.com > Mail > Change Settings > Activate mail service on this domain: