15 messages in net.sourceforge.lists.courier-usersRe: [courier-users] Weird messages re...
FromSent OnAttachments
M CoreOct 18, 2007 11:13 pm 
Gordan BobicOct 19, 2007 12:56 am 
Leigh S. Jones, KR6XOct 19, 2007 6:01 am 
Alessandro VeselyOct 19, 2007 7:28 am 
M CoreOct 19, 2007 8:07 am 
Gordan BobicOct 19, 2007 8:24 am 
Marcin 'Rambo' RoguskiOct 19, 2007 8:29 am 
Gordan BobicOct 19, 2007 8:36 am 
Johnny C. LamOct 19, 2007 9:26 am 
Alessandro VeselyOct 19, 2007 10:28 am 
Alessandro VeselyOct 19, 2007 11:14 am 
M CoreOct 19, 2007 1:11 pm 
Johnny C. LamOct 19, 2007 1:34 pm 
Gordon MessmerOct 19, 2007 4:18 pm 
Gordon MessmerOct 19, 2007 4:21 pm 
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Subject:Re: [courier-users] Weird messages receivedActions...
From:Gordon Messmer (yiny@eburg.com)
Date:Oct 19, 2007 4:21:10 pm
List:net.sourceforge.lists.courier-users

Gordan Bobic wrote:

But now that you mentioned it - is there a way to make Courier make an additional check? ... Normally, this is not too plausible to check if from is for a non-locally hosted domain, but if from is from a locally hosted domain, can we make Courier check if from is deliverable, and if not, reject with "unknown sender" or some such?

You can make courier do almost anything. :)

http://phantom.dragonsdawn.net/~gordon/courier-pythonfilter/testfilters/localsenders.py

I haven't tested that, but that's more or less how you could test "local" sender addresses.

On a separate note, is it possible to get Courier to do return path verification? i.e. for the from address, look up mx, connect, and do: HELO, MAIL FROM, RCPT TO, QUIT, just to see if the FROM address is deliverable?

Yes, the "dialback" pythonfilter does that. It wasn't usable for a long time, due to limitations in Python, but should be these days.