> On May 1, 2018, at 3:31 AM, Jasen Betts via Exim-users <exim-users@???> wrote:
>
> RFC5322 makes no concrete restrictions on From header content.
This is of course false.
https://tools.ietf.org/html/rfc5322#section-3.6.2
from = "From:" mailbox-list CRLF
Which then translates to:
mailbox-list = (mailbox *("," mailbox)) / obs-mbox-list
mailbox = name-addr / addr-spec
name-addr = [display-name] angle-addr
angle-addr = [CFWS] "<" addr-spec ">" [CFWS] / obs-angle-addr
Which, ignoring the obsolete forms rather requires an addr-spec, which
is not a "phrase" and so must not be encoded in structured headers.
--
Viktor.
