Load balancing email server [duplicate]

Question

Possible Duplicate:
DNS e-mail load balancing

My scenario is:

php-script(mail originating) -> DNS load balancer (vps server).--vps1(relayhost 1)
                                                              |--vps2(relayhost 2)
                                                              |--vps3(relayhost 3)

When I'm sending text mail (size ~8 KB) from a php script to a load balancer that is balancing the load of mails and delivering them to relay servers. I have relayed 40,000 mails for a mail campaign by using this.

But when I embedded an image in my mail (image size ~160 KB) the load balancer does not deliver any mail to clients.

Is this an issue of mail size or could it be another issue?

Answer 1

This issue is entirely dependent upon what kind of load balancer you are using and what its configuration is. Since you haven't told us anything about that setup, it's impossible to help you.

However, let's talk about something slightly different, and yet to your benefit. If you have an image to place in your emails, you would likely benefit much more from placing it on a web server and embedding an HTML <img> tag in the emails. That keeps your email size down and also gives you an ability to track open rates and other statistics.