How To Load Balance Smtp

server smtp1 10.0.0.1:25 check server smtp2 10.0.0.2:25 check server smtp3 10.0.0.3:25 check backup

mail1.example.com A 192.0.2.10 mail2.example.com A 192.0.2.11 how to load balance smtp

Unlike web apps, SMTP does not strictly require "sticky sessions" (persistence) if you have Shared Storage. However, you do need capabilities. server smtp1 10

Loading balancing SMTP (Simple Mail Transfer Protocol) is more complex than load balancing HTTP because SMTP is stateful and stores data (emails) on disk. You cannot simply round-robin traffic to multiple servers without a shared storage strategy, or emails will end up scattered across different servers, making management impossible. making management impossible.