Author: Andrey N Oktyabrski Date: To: exim-dev Subject: [exim-dev] [Bug 1066] interpret some 4xx error codes from remote
server as permanent errors (5xx). Sometimes the Postfix MTA returns 4xx
error when mailbox does not exist
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--- Comment #11 from Andrey N. Oktyabrski <ano@???> 2011-01-13 13:42:05 ---
(In reply to comment #10)
... > I appreciate that there are several "accepted" breaches of protocol already
> (the underscore workaround in HELO/EHLO, for example) but I personally believe
> that this would be going a step too far. This step is not so far because tons of other wrong things exists and we must
live with it.
> I stand by the previous comment (and yes, I run a large mail system) that if a
> remote server tells you something then you should not subvert the meaning of
> that response, either by upgrading it (as proposed) or downgrading it, nor just
> ignoring it. That way madness lies - cf. Hotmail's "amazing disappearing email"
> trick where they tell you the message has been accepted, but it never
> arrives... Then we must not use the "allow_mx_to_ip = yes", "helo_accept_junk_hosts", must
not receive mail with helo/ehlo without a point (".") (because HELO must be
FQDN) and so on... Right?