Za'mbori, Zolta'n wrote:
RFC2821, 3.7 Relaying:
"In general, the availability of Mail eXchanger records in the domain
name system [22, 27] makes the use of explicit source routes in the
Internet mail system unnecessary" (in the RCPT command).
Is it true that because of "the availability of designated sender
records in the domain name system makes the use of explicit source
routes in the Internet mail system necessary" (in the MAIL command)?
If you want forwarding / 3rd party relaying to work. I believe you're
right. Pretty much.
See: http://spf.pobox.com/objections.html
As you suggest - RMX type systems look a lot like the mirror-image of MX.
But of course, these source routes MUST NOT be truly *explicit* - or a new
channel for abuse is opened up - the "bounce path". Without a
complementary, and secure, Sender Rewriting Scheme (or something), I can't
see that a system like SPF is much use in the real world.
--
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