Author: Michael Deutschmann Date: To: exim-users Subject: Re: [exim] RFC 1892 in Exim
On Fri, 2 Aug 2013, bitozoid wrote: > Exim is delivering 'Mail delivery failed' without the right 'Content-Type'
> as defined in RFC 1892. Is this a 'exim-daemon-light' issue, or is there
> anything misconfigured?
Exim does not support RFC 1892. It just does what all SMTP MTA
implementations did before that was invented -- return bounces using a
private format.
This is because Philip Hazel was never a fan of MIME. He felt it was
only something MUAs should worry about, and the processing does not belong
in MTAs. For the same reason, RFC-compliant 8BITMIME support (which
requires MIME downconversion) was never added.
(MIME ACLs were a feature imported from the Exiscan project, not Philip's
work.)
RFC 1892 is obsolete, by the way. The current relevant standard is RFC
6522.
