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Accepted
Abraham Vegh
Asked: 2011-09-12 18:49:38 +0800 CST

Using Postfix+Dovecot+MySQL, enable a catch-all+forward for a domain, while still allowing authenticated outgoing access

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I have a server with Debian 6 (Squeeze), running Postfix, Dovecot, and using MySQL as the backing store for virtual email accounts.

For my domain example.com, I have a ‘catch-all’ @example.com that forwards to myaccount@gmail.com.

I want to allow an authenticated user to log in as me@example.com to use SMTP (and thus take advantage of SPF validation and DKIM signing), but not allow Postfix to deliver mail sent to me@example.com to Dovecot. Configuring a ‘full’ account in the MySQL database causes this to happen, so far as I can tell.

How can I do this? Am I approaching this in the wrong way?

postfix dovecot debian-squeeze

1 Answers

  1. Best Answer

    Postfix is intelligent enough to not deliver mail to Dovecot if you are forwarding mail for that address.

    In practice, this means a minimum of four records are required in the MySQL database:

    domains: example.com
    forwardings: @example.com -> me@example.com
    forwardings: me@example.com -> myaccount@gmail.com
    users: me@example.com, somepassword

    With this configuration, Postfix will deliver all mail to example.com to myaccount@gmail.com, but still allow me@example.com to log in via SMTP and send outgoing mail, enabling that mail to, e.g. be signed for DKIM.

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