On Thu 02/May/2024 21:02:28 +0200 John Levine via mailop wrote:
While debugging something else, I've been trying to send messages to myself
from the address a...@m.jl.ly. RFC 5321 says two dots in a row need to be
quoted, and I have checked that my mail system does indeed put in the quotes
and it says
MAIL FROM:<"a..b"@m.jl.ly>
Useless to recall the famous sentence of RFC 5321, where it defines the address
syntax (Section 4.1.2):
While the above definition for Local-part is relatively permissive,
for maximum interoperability, a host that expects to receive mail
SHOULD avoid defining mailboxes where the Local-part requires (or
uses) the Quoted-string form or where the Local-part is case-
sensitive.
Best
Ale
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