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How to let the MDA bounce a message
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ska  
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 More options Nov 30 2005, 5:10 am
Newsgroups: comp.mail.sendmail
From: "ska" <s...@mail.inf.fh-brs.de>
Date: 30 Nov 2005 02:10:53 -0800
Local: Wed, Nov 30 2005 5:10 am
Subject: How to let the MDA bounce a message
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Hello,

is it possible to let the MDA (LDA) ultimately decide during the SMTP
dialogue whether or not a recipient exists, in order to return a non-OK
SMTP code rather than a negative DSN bounce message?

sendmail 8.13.4 with a custom MDA.

Thanks,

Steffen


 
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Andrzej Adam Filip  
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 More options Nov 30 2005, 5:26 am
Newsgroups: comp.mail.sendmail
From: Andrzej Adam Filip <a...@priv.onet.pl>
Date: 30 Nov 2005 11:26:09 +0100
Local: Wed, Nov 30 2005 5:26 am
Subject: Re: How to let the MDA bounce a message
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"ska" <s...@mail.inf.fh-brs.de> writes:
> is it possible to let the MDA (LDA) ultimately decide during the SMTP
> dialogue whether or not a recipient exists, in order to return a
> non-OK SMTP code rather than a negative DSN bounce message?

> sendmail 8.13.4 with a custom MDA.

Could you provide more data?

* Sendmail calls LDA *after* acknowledging all "RCPT TO:"

* Sendmail checks OS account existence for mailers with F=w flag set
before sending reply to "RCPT TO:"
You can compile your own MailboxDatabase routines in sendmail source
code to provide alternative checks

* You can use "socket map protocol" to allow sendmail asking your custom
daemon about recipient existence
e.g. cyrus-imapd has implemented smmapd daemon/service for such purpose

--
[en: Andrew] Andrzej Adam Filip : a...@priv.onet.pl : a...@xl.wp.pl
http://www.sendmail.org/faq/ http://www.sendmail.org/m4/readme.html
http://anfi.homeunix.net/sendmail/  Netcraft Site Rank: 488518


 
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ska  
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 More options Dec 1 2005, 7:57 am
Newsgroups: comp.mail.sendmail
From: "ska" <s...@mail.inf.fh-brs.de>
Date: 1 Dec 2005 04:57:47 -0800
Local: Thurs, Dec 1 2005 7:57 am
Subject: Re: How to let the MDA bounce a message
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Sorry, there is a misunderstanding.

I'm contentedly with the ability of sendmail to detect the existance of
a recipient, but I would fine grain which message gets queued in order
to be delivered in a next run, or which are failed permanently or
temporatily after the SMTP DATA phase.

I know that you have to take precausions, if the mail has multiple
recipients, as the reply effects the deliviery status of all of them.

Steffen


 
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