For what it's worth, I was in the same boat last year and made the decision to move it to a new server. Set up a new CentOS 7 box as a virtual server at linode. Which was very painless. The install of the toaster on that box was a breeze, the guys have done a great job of supplying us with RPMs and scripts to get it done easily.

Moving over all the old mail was likewise very easy and just worked. I rsync'd from the old box to the new. The tricky part is cutting the users over. You need to set your DNS ttl to something really low (I first set mine to 4 hours, then to 1 minute the day of the cutover). That makes your mx and A records move very quickly. At cut time, change your dns, do a final rsync of all the old mail, make sure you're ownership and permissions are all right and you're done.

The transition was much smoother and easier than I had thought and everything worked like a charm.

So while it's not what you're looking for in terms of a short term fix. I do encourage you to take the plunge and move it. It's really not that bad and will clean up your entire environment.


On 2/15/2018 9:16 AM, Angus McIntyre wrote:
I'm running a fairly ancient qmail (netqmail-1.0.5, according to the manual) on CentOS 5, and I'm starting to get bitten with increasing frequency by the 'CNAME lookup failed temporarily' bug.

I urgently need to build a new host with an up-to-date OS and the latest version of qmail and move everything over, but I don't have the time to do that right now. I'm very hesitant to screw with this particular configuration (which is a mess) in case I bring everything crashing down around my ears.

So the question is, is there any easy (temporary) fix for this issue?



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