I have been using a standard mail-in-a-box setup for almost two years now. The server has been the same during that time, and almost nothing has gone wrong so far.
After upgrading to 0.28 almost two months ago I have what appear to be DNS outages. The server is not crashing, but I am unable to resolve the host every few hours, for a few hours. These windows of ‘downtime’ are rather random, but they do happen at least once a day.
I spoke with my hosting provider and they don’t see anything on their end. On my end, I am not sure what I need to look for.
When the admin panel is accessible I can see that all status checks are green. I’ve tried re-running the MIAB setup twice now.
What is the best way to debug this?