On Wed, 30 Oct 2013 11:44:19 -0400 David F. Skoll wrote: > On Wed, 30 Oct 2013 11:06:35 -0500 > Adam Moffett <adamli...@plexicomm.net> wrote: > > > I'm reasonably sure that user@ip makes a valid address, but even if > > it is I don't think I've ever observed it anywhere. > > My reading of RFC5321 seems to indicate that "user@1.2.3.4" is NOT a > valid address. It should instead be written as "user@[1.2.3.4]"
If you are referring to 4.1.3. I would say it's defining a routing mechanism rather than limiting what a valid address is. Personally I don't think it matters - almost all SpamAssassin tests penalize RFC compliant behaviour, and plenty of RFC violations are neutral indicators.
