>Oct 1 13:31:46 xxxx sendmail[30321]: 291BVjjx030318: to=<x...@gmail.com>, >delay=00:00:01, xdelay=00:00:01, mailer=esmtp, pri=122536, >relay=gmail-smtp-in.l.google.com. [142.250.102.27], dsn=2.0.0, stat=Sent (OK >1664623906 gs19-20020a1709072d1300b00777a40d515dsi4096082ejc.456 - gsmtp) > >I just tested for you, enabled the sieve forward, send test mail and the >forward is being accepted by google. > >
It looks to me you're dismissing the fact that it only concerns the forwarding of mails that have originally a "bogus" Message-ID. That's the only way to trigger the issue. Other mails (that are missing Message-ID or having RFC compliant Message-ID are forwarded and accepted just fine by gmail :)