On Mon, 3 Dec 2018 21:15:20 -0700 Grant Taylor wrote: > As far as I know, (other than LONG deprecated source routing) the @ > character is a reserved special character and can't be used used as > part of the local part.
Syntactically, it can be used as long as it's properly quoted or escaped. The use of such addresses is discouraged under SMTP, but only with a "SHOULD NOT".
