2

I'm currently using a postfix server with 4 IP (relay1, relay2, relay 3, relay4) for outgoing emails I'm using transport_maps to define for each email domain (outlook.fr, orange.fr ...) the relay to use It works well but I just realized that my postfix active queue was full, having mostly orange.fr emails, it gets quickly full as only 1 relay is defined to send emails for that domain.

What I'm trying to do is to load balance orange.fr emails between the 4 IP while keeping transport_maps to manage other email domains I tried using sender_dependent_default_transport_maps = randmap:{relay1,relay2,relay3,relay4} for load balancing and it works but for all domains.

In postfix release notes a solution seems given but I cannot have it to work: http://postfix.cs.utah.edu/source/official/postfix-3.0.0-RC1.RELEASE_NOTES

/etc/postfix/main.cf:
    transport_maps = 
        # Deliver my own domain as usual.
        hash:/etc/postfix/transport 
        # Deliver other domains via randomly-selected relayhosts
        randmap:{smtp:smtp0.example.com, smtp:smtp1.example.com}

From my understanding postfix should read first transport_maps and if the domain is not found send using randmap. But in this case only randmap is working.

Summary:

If I use only transport file = emails are sent to specific relays but can't have one or more relays for a given domain If I use only randmap = emails are sent using the 4 IP but i cant specify relays for specific domains If I use transport and randmap = transport file seems ignored, only randmap is effective

Any idea how to do that?

Dharman
  • 30,962
  • 25
  • 85
  • 135
Nino Noisette
  • 21
  • 1
  • 3

1 Answers1

0

I'm not sure how you configured your master.cf or your server so I'll just share my experience

My server has 5 IP (let's call them int1-int5)

First I configured these as interfaces in my master.cf

Example with int1

int1        unix  -       -       n       -       -       smtp
     -o smtp_helo_name=int1.domain.com
     -o syslog_name=postfix-int1
     -o smtp_bind_address=x.x.x.x

My main.cf :

sender_dependent_default_transport_maps = hash:/etc/postfix/sender_transport randmap:{int1,int2,int3,int4,int5}

smtp_connection_cache_on_demand = no

transport_maps = hash:/etc/postfix/transport

sender_dependent_default_transport_maps = randmap:{int1,int2,int3,int4,int5} : the load balancing

sender_dependent_default_transport_maps = hash:/etc/postfix/sender_transport : specific relay for senders (mail from)

transport_maps = hash:/etc/postfix/transport : specific relay for recipients (mail to)

/etc/postfix/sender_transport or hash:/etc/postfix/transport example :

user@domain1.com int5:
domain2.com int5:
Scol
  • 1