On Tue, Dec 29, 2009 at 04:07:01PM -0800, Daniel L. Miller wrote:
> My understanding is a MUA (for convenience, call it Thunderbird) will talk
> to a local MTA (Postfix, of course!) to send mail. After authentication and
> any other local checks, the local MTA accepts responsibility for the message
> - the MUA disconnects. The local MTA then attempts to send the message to
> the remote MTA. If successful...unless there's something else I don't know
> about, nothing further happens between the local MTA and MUA. If
> unsuccessful, and idiot OP's like me don't have soft_bounce enabled, the MTA
> will generate a bounce message and send it to the sender's address, and
> cancel the send.
Then do the recipient domain validity check *before* accepting and
queuing the message: put "reject_unknown_recipient_domain" in your
smtpd_recipient_restrictions. This will make Postfix respond with:
450 4.1.2 <x...@y.z>: Recipient address rejected: Domain not found
Geert
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Geert Hendrickx -=- g...@telenet.be -=- PGP: 0xC4BB9E9F
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