On Mon, Dec 24, 2007 at 12:19:43PM +0100, Toni Mueller wrote:
On Mon, 24.12.2007 at 07:29:58 +0100, Turbo Fredriksson <turbo@debian.org> wrote:be done by an MTA (it isn't in the SMTP RFC that I know of).What has this to do with RFCs? I didn't see any particular statement demanding that mails to unknown recipients have to be accepted or rejected.
What the RFC requires is that *if* you accept a mail and then find it undeliverable, you must send a non-delivery receipt (NDR). Because of the huge problems with spam that you outlined, most MTAs reject unknown recipients at SMTP time to avoid sending backscatter, since it is trivial to forge SMTP and RFC2822 information. Then they never have to send an NDR to anyone but their own users, preventing backscatter.
While I personally dislike qmail because of this problem, and because it is gratuitously incompatible with every other mail system, if this problem can be fixed, I see no reason why it should not be in the archive, assuming someone wants to maintain it.
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