Exim 4.94 problem after upgrade

[Active8]

It turned out I had a corrupted blacklist_domains in my /etc/virtual folder

Something you must be worried about, Hard disk dying ?

 

[mxroute]

Nothing changed in DNS and MX, it always worked

These are words we all die by, be careful of them. The only constant on the internet is that nothing is constant, especially if no one has touched it. Always check the things you assume are fine.

I always remember the famous words from HG customers "I didn't touch it so it must be your problem" when in fact their not touching it was exactly why it failed, they never updated old code.