Increasing 571 Delivery not authorized, message refused happenings
since about week we have an increasing number of E-Mails which are rejected by our watchguard spam blocker with the above message. I had just such a case where someone could not send an E-Mail from a gmail account to one of our e-mail addresses. The E-Mail with the error message from gmail could be sent to my E-Mail address, obvisiouly both E-Mails accounts are one the same server and behind the same Watchguard T15 Firewall.
I believe this has been startet after upgrading from 12.5.3.B621090 to 12.5.7.B638640 last week.
Has someone similiar problems?