SmarterMail Enterprise is rejecting a large volume of email (@50%) from SmarterMail Incoming Gateways using either SMTP Verification or SmarterMail Gateway Web Service. There does not seem any rhyme or reason as to why it is giving a "550 Relay is not allowed" error for the messages rejected as the messages would otherwise pass FcRDNS, SPF, DKIM. and DMARC and the recipient does indeed exist.

I did notice that Build 8832 seems to give no other 550 errors on the Incoming Gateways, such as "No such user". Apparently all 550 responses are "Relay is not allowed" now.

Also, Incoming SmarterMail Gateways are triggering IDS Harvesting and IDS Denial Of Service on SmarterMail Enterprise now (they did not on Builds prior to 8768). This is resulting in our Incoming Gateways being blocked every 10-15 minutes. Any idea how to prevent this from occurring on Build 8768-8832?