[FIX] ir_mail_server: use local envelope sender rather than spoofing it

Acting as a mailing-list-like distribution system, the system used
to set the enveloper sender (aka bounce address) to the From header
of the message, effectively pretending to be the original sender.

In some cases the domain of the From header explicitly forbids
sending emails from external systems (e.g. with a hardfail SPF
record), so this could cause the email to be rejected by some
spam filters, depending on their policies.

The system will now use a local bounce address in the form:
  mail-catchall-alias@mail-catchall-domain
or, if no catchall is configured:
  postmaster-odoo@mail-catchall-domain
(as soon there is a mail.catchall.domain configured)
It will only fallback to using the From header when no
catchall domain is configured.

Fixes issue #3347.
Closes #3393.

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