Been using Sophos for a long time. Started on UTM back in the Astaro days. Love the product. Switched everything over to XG a little over a year ago, but have had issues around the MTA, so most of my mail is still flowing through my UTM.
When I set my outbound to go through my XG, the mail gets stuck in the outbound mail queue, the log says "queued for scanning" and just sits there. Several days later, I get a "Failure" notice in my inbox due to excessive retries. There are no other entries in the log.
The Undeliverable comes back with a "Remote Server returned '< #5.0.0>'" and the headers in it are not helpful in the least. The only thing I can see is that my tests seem to all be using IPv6, which I do have setup and fully functional.
Any help is greatly appreciated.
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