"....I'm going to setup MX records for the 500+ domains we have. Half
of them will have relay1 as their primary and half of them will have
relay2 as their primary. The remaining server will be set as secondary
MX....."
Depends what Matt meant by 'the remaining server' ie the 'other' 1U, or
the LDA...
Good point, I glossed right over that and made an assumption he was
talking about the other 1U, but it appears it refers to the LDA. In
that case, all your comments are 100% correct. The LDA will get
slammed if it is set up as secondary. Most notably by dictionary
attacks.
I meant the remaining server for each situation. In other words, the
domains that have relay1 setup as primary MX will have relay2 as
secondary. The domains that have relay2 as primary will have the
"remaining server" (relay1) set as secondary. That way its full
redundancy if one goes down.
The main mail server will ONLY accept incoming messages from the two 1U's
Hope that clarifies.
-Matt
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