Hi, hoping someone can help.
I have a situation that I want to send all outgoing mail to 3 servers that are part of a spam cluster which will check the email for spam and deliver it. I was thinking of creating a host in DNS, for example smtp-relay and have it point to 3 different ip addresses that correspond to the 3 spam cluster servers. Will this create an issue if postfix does a dns lookup for smtp-relay and gets an ip that is down, will it try again, or is it best to just use all 3 servers names in the relayhost option? Another question is, suppose all three servers are down, can I have postfix directly deliver the email if all relayhosts are down, how can I do this? Sorry if this has been answered I looked and couldn't find it. Thanks, Paul
