On May 3, 2020, at 11:57 AM, John C Klensin <john-ietf(_at_)jck(_dot_)com>
wrote:
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:
first(_dot_)last(_at_)example(_dot_)org
/////.////@example.org
are both OK, but
"/../"@example.org
".///"@example.org
"///."@example.org
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.
--
Viktor.
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