Postfix handling Amazon SES Maximum Send Rate error

Question

We have a postfix server which we were using to send emails. This server is used by many services. Thus for using Amazon SES, I've integrated our postfix server with SES SMTP interface ( using "http://docs.aws.amazon.com/ses/latest/DeveloperGuide/postfix.html" ). The configuration is working fine and mails are getting delivered properly.

Now, there is a limit of 5 email/sec, imposed by SES and it raises error '454 Throttling failure: Maximum sending rate exceeded ' if limit exceeds.

I'm a newbie to Postfix. Kindly guide me with the configuration settings in Postfix to make postfix resend the mail when error '454 Throttling failure: Maximum sending rate exceeded' occurs.

Also, how to resend email, when occasionally 'Connection timed out' error occurs with relay server(Amazon SES).

Answer 1

This is not the actual answer you are asked,but you can bypass the issue with this,

You can add this lines in main.cf file

default_destination_concurrency_limit=1 default_destination_rate_delay=10s

This will increase the time delay but you don't get the error message.

You can also verify this link to learn more about postfix performance turning

Answer 2

I was wondering the same thing so I tried it out on a fresh postfix install. I found that no additional configuration was required and postfix did indeed retry sending the messages about 5 minutes after original throttling error was reported in the log file.