2. When my DSL line goes down, my DSL modem knows to instead dial up my ISP, at which point its external address (and thus the visible address of my SIMS machine) becomes "backup.brotsky.com".
So backup.brotsky.com has a different IP address, correct?
This answer works great for incoming mail, because machines that send to backup.brotsky.com couldn't care less that the machine that answers claims to be mail.brotsky.com. But this answer works much less well for outgoing mail, because servers that do reverse DNS confirmation more stringent than "make sure this IP is really listed in the MX records for the domain it claims to be in" do not like the fact that backup.brotsky.com is saying "helo mail.brotsky.com".Why not change the reverse IP record so that the IP of backup.brotsky.com is listed as "mail.brotsky.com"? That way it'll match the HELO. Incoming should still work, since your forward DNS still routes backup.brotsky.com to that IP.
--
Bill Christensen
http://greenbuilder.com/contact/
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