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I have set up a Postfix server with SMTP AUTH (STARTTLS on port 587). All my users are in the domain "example.org". I want to enforce the sender address to be "logged-in-user@example.org".

I learned that this can be achieved with the main.cf options

smtpd_sender_restrictions = reject_sender_login_mismatch, ...
smtpd_sender_login_maps = hash:/etc/postfix/smtpd_sender_login_maps

with a login_maps file like:

a@example.org a
b@example.org b
c@example.org c
...

(see also Block sender address spoofing with SMPT AUTH), but this would mean I'll have to edit the login_maps file every time I have a new user. I don't need such a flexible mapping: It should always be "logged-in-user@example.org". Is there an easier option?

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2 Answers

up vote 2 down vote accepted

You need pcre regex compiled in Postfix. Or the distribution already includes pcre. postconf -m should show a line with pcre in it. And then you can do:

/etc/postfix/login_maps.pcre:

/^(.*)@example.org$/   ${1}

In main.cf:

smtpd_sender_login_maps = pcre:/etc/postfix/login_maps.pcre

Should work fine as expected. If not let me know so that I edit it when needed.

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This is perfect. Exactly what I was looking for! –  Chris Lercher Oct 4 '11 at 18:56
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Can you use combination of regexp on the header as shown here: http://www.akadia.com/services/postfix_uce.html? Then you can combine with regexp like [*@example.org] to ensure only sender from example.org.

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Let's assume, I can use "regexp:" here (?) How can I specify the regexp such, that user "a" can send as "a@example.org" but not as "b@example.org"? –  Chris Lercher Oct 4 '11 at 14:58
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