Re: [exim] Is a secondary MX worth the effort?

>>> > One of the things I've considered for #2 is having a secondary MX
>>> > which is configured to give back a 4xx for everything.

> I understand the value in this setup as a SPAM honeypot, but the
> question I suppose I still need answered: Is there [technically] any
> availability benefit provided by a second MX of this nature versus the

The only benefit is not based on availability stuff. It's because of broken senders who freak out if they can't connect to the
primary. However, someone else posted that there is a popular MTA that will stick with a secondary MX once it falls back to it.
In that case, the 4xx secondary is a loser.