Milter-greylist

Hello,

> It is only the Redhat 8.0 system that fails with the cannot start MX 
> sync error. All the other systems load fine. What is really strange is 
> the error states that the address is already in use. I can't imagine 
> what would be causing milter-greylist to think this.

I attach a patch that you can apply to the code. This surely not solve your
problem
but may give some hints where the problem might be.
God knows what else can be broken. At least we will be sure that you try to
bind to port 5252.

On the other hand if you are running as non-privileged user the
milter-greylist
please try it out as root.

Bests,
Attila