[SC-Help] How to Handle Reverse Delegation for Muti-IP mail Host

[CHANGE USERNAME TO westes]

Many sites on the Internet no longer accept mail if the reverse IP does not
match the forward IP, using the domain name that sendmail announces when it
connects while sending mail.   I understand how to handle reverse delegation
to make these match for a simple case, but I have a question for a more
complex case.

We have our mail server connected to two different networks, for redundancy.
For receiving incoming mail, this works great, and we can set the MX records
to mail1.mysite.com and mail2.mysite.com, each of which resolves to an IP on
a different network.    Now how do I handle outgoing mail?   One solution
would be to have the generic host mail.mysite.com resolve to two different
IP addresses.   But I'm thinkingt that may cause problems.   The reverse
delegation for the two different IP addresses should show one hostname
(i.e., mail.mysite.com), but would there be other issues that make using
more than one IP for sending mail problematic?

-- 
Will
westes AT earthbroadcast.com