Problem with sending emails from CRM through Amazon SES SMTP

Hi

I have today changed my server (with new IP) and migrated all the websites to the new server. I am using WHM/Cpanel in my server for hosting and managing websites. The emails were working fine with the old server and as soon as we migrated to the new server, the emails stopped working.

Here is our server configuration Old Server: Contabo L New server Contabo XL Using SMTP from Amazon SES to send emails from CRM

This didn't happened with just one website, we have installed CRM on about total 3 account and all facing same problem. The CRM we have installed on each website is not able to send emails out and we are getting these error as attached here. I know this is a minor error need some tweeks in the new server so that what reflect the budget.

Also there is a point to note that I migrated one website back to my old server and the emails started working back on this website.

Anybody who knows what's the problem is please write more details in your proposal to get contacted. Thanks