I have a site that send out emails from a postfix server. They have multiple broadband lines for load balancing and failover. I want them to be able to send out emails though both lines without the risk of being blocked as spam.
Both lines have a static address and have a PTR record on them which also have a records that resolve to the IP addresses
in the main.cf myhostname = server.domain.com
SPF records are also being configured as well
my main question is: should the first line on server.domain.com go down would there be a risk of the emails being blocked as spam if they go though server2.domain.com? as myhostname is different?