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]"

On 30.10.13 17:53, RW wrote:
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.

4.1.2 defines it as part of mail address:

   address-literal  = "[" ( IPv4-address-literal /
                    IPv6-address-literal /
                    General-address-literal ) "]"

   Mailbox        = Local-part "@" ( Domain / address-literal )


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