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Unable to send email or connect to SMTP: connect #5 to subsystem private/rewrite: Connection refused

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Vincent Lauton
Updated
Plesk for Linux kb: technical

Symptoms

  • Unable to send an email with the following error in /var/log/maillog file:

    postfix/qmgr[8738]: warning: connect #5 to subsystem private/rewrite: Connection refused
    postfix/pickup[8739]: warning: connect #5 to subsystem public/cleanup: Connection refused

Cause

Wrong configuration in the /etc/postfix/master.cf file

Resolution

  1. Connect to the server via SSH

  2. Create a backup for /etc/postfix/master.cf file:

    # cp -pr /etc/postfix/master.cf /etc/postfix/master.cf.$(date +'%Y-%m-%d_%T')

  3. Copy /etc/postfix/master.cf file content from working instance of Plesk

  4. Restart Postfix service:

    # systemctl restart postfix

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