Mail service is not working after Plesk server restart: connect to 127.0.0.1:10024 Connection refused

Symptoms

• Plesk server was restarted recently.

• Plesk Email Security is installed on the server.

• Unable to send or to receive emails when Plesk Email security is installed, the following errors are shown in log file /var/log/maillog:

  postfix/error[14288]: 6BE2A43D60: to=[email protected], relay=none, delay=139128, delays=139128/0.05/0/0.02, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to 127.0.0.1[127.0.0.1]:10024: Connection refused)

Cause

Amavis autostart is disabled as seen here:

# systemctl status amavisd
amavisd.service – Amavis mail content checker
Loaded: loaded (/usr/lib/systemd/system/amavisd.service; disabled; vendor preset: disabled)

Resolution

1. Log in to Plesk server via SSH

2. Enable Amavis service:

   # systemctl enable amavisd

3. Start Amavis service:

   # systemctl start amavisd

4. Resend the deferred emails in Postfix:

   Note: The mail queue can take some minutes to be processed. Monitor the mail queue by Logging into Plesk GUI > Tools & Settings > Mail Server Settings > Mail Queue or over the command mailq