Re: [EXIM] Bug#23763: exim SMTP handling is strange

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Autor: Galen Hazelwood
Datum:  
To: Avery Pennarun
CC: Nigel Metheringham, exim-users
Betreff: Re: [EXIM] Bug#23763: exim SMTP handling is strange
Avery Pennarun wrote:
> Should fetchmail detect and work around this condition, but not exim? Why?


Mail servers have to work on the assumption that other mail servers
understand and respect RFC822, and won't do silly things like place
non-header lines in front of the headers in a message. A overly
paranoid mail server will only get in your way whenever you really
_want_ to do something unusual.

Fetchmail is different. It's a glue program which takes mailbox
protocols (POP-3, IMAP) and turns them into SMTP, something which the
authors of these protocols never really intended. Because all sorts of
nasty things can happen due to stupid mailbox formats, stupid server
implementations, protocol brain damage, etc., fetchmail is morally
obligated to shoulder the burden of sanity checking the messages it
grabs before it passes them to naive and trusting SMTP servers.

--Galen Hazelwood

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