John R Levine <johnl(_at_)taugh(_dot_)com> wrote:
So my reading is that while 5321 tells me that it's OK to use a CNAME in MAIL
FROM/RCPT TO, 1123 still tells me that it's better to resolve those CNAMEs
I hope that nobody who matters believes this, but if you look at the two
documents it's not a totally ridiculous way to reconcile them.
Sendmail still does RFC 1123 mail domain canonicalization unless you use
Qmail does it unconditionally (and uses DNS ANY queries in the process).
f.anthony.n.finch <dot(_at_)dotat(_dot_)at> http://dotat.at/ - I xn--zr8h
Shannon: Cyclonic becoming southwesterly 5 or 6, occasionally 7 in south,
decreasing 4 at times later. Moderate or rough. Rain, then drizzle later, fog
patches. Moderate or poor, occasionally very poor.
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