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    Common Virtualmin Postfix issue

    I. Cannot be enabled unless a BCC map

    Failed to save enabled features : Automatic BCCing of outgoing email cannot be enabled unless a BCC map is defined.


    1. Go to Webmin → Servers → Postfix Mail Server.
    2. Click on the BCC Mapping icon, and make sure the Sender BCC mapping lookup tables field is set. If it is not, you should enter a map specification like hash:/etc/postfix/bcc . Then click the Save and Apply button.
    3. Go to System Settings → Module Config, and change the Allow automatic BCCing of outgoing email? field to Yes, then click Save. If Virtualmin prompts you to re-check the configuration, do so.

    II. Mail with virtual host

    1. Need to install Postfix
    2. Enable feature from Virtualmin > System Settings > Features & Plugin select Mail for domain > Save
    3. Enable feature on domain Virtualmin > select Domain > Edit Virtual Server > Enable Features > select Mail for domain > Save

    III. Reject by destination and networks

    NOQUEUE: reject: RCPT from[]: 454 4.7.1 <[email protected]>: Relay access denied; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<>

    setup mynetworks that include your local domain

    add smtpd restriction

    smtpd_recipient_restrictions = permit_mynetworks defer_unauth_destination
    smtpd_relay_restrictions = permit_mynetworks defer_unauth_destination

    IV. Recipient address rejected: User unknown in virtual alias table

    re-create user again

    V. Reject by unknown destination

    NOQUEUE: reject: RCPT from unknown[your-ip]: 454 4.7.1 Relay access denied;

    Add defer_unauth_destination into smtpd_relay_restrictions

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