We send email on behalf of customers as part of our product and run outbound only mail servers for this. Thus we send out mail with many different sender addresses. Some customers have asked us to relay their mail through their servers, which we are happy to do. sender_dependent_relayhost_maps works great for this. However, we also have some custom transport_maps in place for some recipient domains (e.g. gmail.com) where we do some throttling. The problem is that transport maps overrides any sender_dependent_relayhost_maps as is documented. Is there any way around this? Can I have rules to relay emails to a different server based on sender address as the first priority and then for anything that doesn't match those rules, then apply other rules such as transport maps that are recipient based?
-- Paulo Fraser Lithium Technologies, Inc. 415.757.3220
