That might work for the websites, but the MX records probably won't like it. I also have this gut feeling it will break something else somewhere.
I already have a temporary solution, which is a program running on my laptop that updates all the domain names with the current IP. It screwed up all my domains when I took my laptop on vacation, and got a different IP. I'm looking at it as a temporary patch, with the proper fix coming from Sophos, which is why I asked. Do you know if the patch is scheduled to be implemented?
If there was no hope whatsoever of the existing patch being applied to the utm, I would give it a try (I've got a lot of domain names, and variations, such as mail.domain.com, store.domain.com, etc). So, are you saying the patch for this bug will never be applied?
Since updates will break it, that's not exactly a reliable route. I'm just fascinated why there is such resistance to fixing a known bug, especially when the patch has existed for 6 years. Well, I suppose it's on to plan B.