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Re: [ietf-smtp] Valid RFC5322 address

2020-05-04 14:13:12

On May 3, 2020, at 11:57 AM, John C Klensin <john-ietf(_at_)jck(_dot_)com> 

You also need to be very careful with the "." following the
colon.  I haven't looked carefully enough at the syntax today to
have any confidence how that would be handled with the
Dot-string production -- you might have to quote the whole
business to make it valid.

Unquoted "." is only valid in a dot-atom, and so:


are both OK, but


all need quoting.  So long as both characters around the "." are "atext",
the "." does not force quoting of a local-part that would not otherwise
require quoting.

In this case, given that the ":" forces quoting, the "." requirements are moot.


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