We currently have a customer who has 2 adsl lines through a watchguard which is splitting and directing the traffic for outages.
They have their mail setup to only send from 1 line (say IP 126.96.36.199 - line 1) which has a reverse dns setup for mail.domain.com
If line 1 goes down, and we let the mail go out of line 2, the rdns will be incorrect, as its going out of ip 188.8.131.52 which has a reverse dns of mail2.domain.com - even though the servers banner is mail.domain.com
Is there any way to have the rdns to 2 different IP's? or is there a better setup?