[FIX] l10n_it_edi: sent certified email without reply-to or return-path

Before this commit, when the domain alias was set (e.g. my_domain.com),
the reply-to and the reply-path were filled with default values using
this domain (e.g. reply-to : catchall@my_domain.com and reply-path:
Return-Path: bounce+number@my_domain.com). As we have a second SMTP
server, the certified email
(https://en.wikipedia.org/wiki/Certified_email), with a different domain
than the domain alias filled in the settings, the SMTP servers will
arise an error : "SMTPRecipientsRefused: Sender address rejected: not
owned by user", this error arise because the domain of the certified
email is different from the one setted in the settings, is also
different from the domains of the reply-to and the return-path.

Now, when we know that we are going to use the certified email SMTP
server, for example to send invoices to the Italian government, the
email will be sent without a reply-to or without a reply-path. This
behaviour is exactly the same as the behaviour will have if we didn't
set a domain alias.

opw-2045244

X-original-commit: 66c5053a