Hey Guys,

I have a question here in regards to redirecting and Load Ballancing SMTP traffic.

We redirect all SMTP traffic to an IP (Linux Server) that runs http://thewalter.net/stef/software/p...rent-full.html

What this does, it ckecks the client IP and if its Blacklisted it drops the connection with 550 Error, however if its safe it creates like a Pipe (connection ) between the client and remote server to perform the SMTP call.

Our issue is now - that we have many SMTP connections and the server cannot take more traffic. So we need to some how load ballance this traffic.

What I have tried is :

LVS : does not work as this should be Layer 3 not 4.
HAProxy : Dont think it would work.
http://lnlb.sourceforge.net/ : this looked Promising however its too old New Kernel does not support it.

Thanks guys

SMTP can be prioritized and if they are all the same priority, it will do round robin on which SMTP server it exits/enters. For instance. I have 3 SMTP servers with priority 10 on all of them. This breaks up the traffic and sends/receives the traffic via different paths. I just have all 3 SMTP servers registered in Public DNS as well as in my exchange environment.

Is this something that would work for you or you actually want to load balance all layer 3 traffic including SMTP?