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List:       courier-users
Subject:    Re: [courier-users] Empty MAIL FROM when sending through an alias
From:       Sam Varshavchik <mrsam () courier-mta ! com>
Date:       2006-06-23 22:18:37
Message-ID: cone.1151101117.558157.23411.500 () commodore ! email-scan ! com
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Rob Wilson writes:

> The first 3 remote users will be accepted but the system will reject
> the last because the MAIL FROM is being sent empty.
> 
> This has only been an issue recently with this specific server.

Which should tell you something.

> The spam software is absolutely causing the rejects. But it's doing so
> because of the empty MAIL FROM.
> 
> Is courier correct in sending the empty MAIL FROM or am I missing a
> setting? Or is the spam software misbehaving?

The so-called 'spam software' is broken.

This is a judgement call.

Aliases should really be used for internal mailboxes only.  They work 
perfectly well for external addresse, but if you really want to run a 
mailing list, use mailing list software, instead of aliases.

When mail gets forwarded through an alias, and gets bounced, if the original 
sender's software uses automated bounce processing, it will obviously have 
no knowledge whatsoever about the aliased address, that it knows nothing 
about, and will not be able to identify and remove the undeliverable mail 
address.  That's considered to be rather rude behavior.

For this reason, mail forwarded through aliases have DSN=NONE set, to 
suppress any bounces.  If the remote mail server is an ancient dinosaur that 
does not implement the DSN ESMTP extension, an empty return address is used 
as a fallback measure.



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