On a Plesk mail server, when sending/reciving email, it fail with following error in /var/log/maillog
Aug 11 19:49:28 vmi274961 postfix/smtp[29276]: E413C3320265: to=, relay=none, delay=0.47, delays=0.47/0/0/0, dsn=4.4.1, status=deferred (connect to 127.0.0.1[127.0.0.1]:10024: Connection refused)
To fix, reinstall email-security extension.
plesk bin extension --uninstall email-security
Verify mail works. If all good, you can reinstall the Plesk mail security extension from Plesk admin
root@vmi274961:~# plesk bin extension --list advisor - Advisor baqend - Speed Kit composer - PHP Composer configurations-troubleshooter - Webserver Configurations Troubleshooter dgri - Imunify QuickPatch digitalocean-spaces-backup - DigitalOcean Spaces Backup diskspace-usage-viewer - Diskspace Usage Viewer dnssec - Plesk DNSSEC domain-connect - Domain Connect email-security - Plesk Email Security firewall - Firewall git - Git google-drive-backup - Google Drive Backup grafana - Grafana heavy-metal-skin - Skins and Color Schemes kernelcare-plesk - KernelCare letsencrypt - Let's Encrypt monitoring - Advanced Monitoring new-relic - New Relic - Application Performance Monitoring pagespeed-insights - Google PageSpeed Insights panel-migrator - Plesk Migrator plesk-mobile - Plesk Mobile Center repair-kit - Repair Kit revisium-antivirus - ImunifyAV site-import - Site Import social-login - Social Login sslit - SSL It! symantec - DigiCert SSL traffic-monitor - Domain Traffic Monitor watchdog - Watchdog wp-toolkit - WordPress Toolkit xovi - SEO Toolkit root@vmi274961:~# plesk bin extension --uninstall email-security The extension was successfully removed. root@vmi274961:~#
If its mail configuration issue, you can run
plesk repair mail
