The balancer passes the original source IP through to the server. Health Monitoring:
Administrators can take individual servers offline for updates or hardware repairs by simply removing them from the load balancer’s active pool, all while the remaining servers handle the traffic. smtp load balancing
⚠️ are rarely needed for SMTP – each email is independent. The balancer passes the original source IP through
sits in front of your mail servers. Clients connect to a single Virtual IP (VIP), and the balancer routes traffic to healthy back-end servers based on algorithms like Round Robin or Least Connections. jaapwesselius.com Technical Implementation Challenges sits in front of your mail servers
Route all emails to @gmail.com recipients through a dedicated MTA pool warmed up for Google, while sending @outlook.com traffic through a separate pool.
Let's build a production-grade SMTP load balancer using (Layer 4) and a pool of Postfix servers on Ubuntu 22.04.
Choosing the wrong scheduling algorithm can cause message reordering, throttling violations, or uneven load.
