DSN Support

As with 8BITMIME, I'm just whipping up a Sendmail wrapper TMDA can call to turn on DSN support.  From this I gather that the feature needed is the ability to pass in arguments to the sendmail program, or the ability to pass parameters into the MAIL and RCPT commands of the downstream submission server, depending on which is selected by the user.

Tip: if you're on Sendmail (the real thing), set O RRTImpliesDSN=T and then have TMDA add a "Return-Receipt-To:" header.  Sendmail will helpfully turn your request into a DSN success, discard the header value and strip it from the next hop output.

Tip: some MTAs (Mercury/32 on Windows, EG) are still honouring Return-Receipt-To even when they themselves do not support DSN.

In these enlightened times of greylisting and other spam-vapourising nonsense, I love DSNs.

Cheers,
Sabahattin

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