Thanks Wietse, but I think I was not clear enough. I'm already doing what you told me to do, but what I'm trying to do is to have one specific SMTP to relay for these specific domains.
I've already done the homework and now have 100% of all domains to this specific destination mapped (it has about 20k domains). So, I'm not sure if this syntax is correct, but I guess it would be something like this (please, correct me if I'm wrong): site1.com [my-specific-server-ip-relay] site2.com [my-specific-server-ip-relay] site3.com [my-specific-server-ip-relay] where [my-specific-server-ip-relay] is the responsible server to deliver to this specific destination. So in other words, I'd have all my SMTP servers sending all messages to my specific SMTP as an alternative SMTP (which is responsible to deliver to this destination). The idea is pretty much like "fallback_relay", the difference is that I don't need any failure to use this SMTP, I want all traffic to these 20k domains going to a specific SMTP so it will be responsible to deliver to the final destination. I hope I've made myself clear enough. Sorry for the bad english. Any help would be very appreciated. Thanks in advance. -- Rafael Em 12/01/2013, às 20:57, Wietse Venema <wie...@porcupine.org> escreveu: > Rafael Azevedo - IAGENTE: >> We're having problems to deliver to specific destination because >> of too many opened connections from the same domain (its spread >> over lots of SMTP servers connection to the same destination, >> hitting the sending limits), so I guess if I just centralize this >> destinations in one only smtp having slow deliveries it might solve >> the problem. > > The present Postfix scheduler does not perform MX record lookups > (nor does it decide which primary and backup MX hosts to connect to). > > To piggy-back deliveries for domains that share the same MX hosts, > you will need transport_map entries that do the piggy-backing for > you: > > # Sites that are hosted at provider1 > vanity1.example smtp:provider1 > vanity2.example smtp:provider1 > > # Sites that are hosted at provider2 > vanity3.example smtp:provider2 > vanity4.example smtp:provider2 > > Wietse
