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setup mail server on own linux

Last Modified: 2012-05-10

For our one site www.imedicusinc.com  would like to setup mail functionality to send mails for register users with accounts like abc@imedicusinc.com

Insted of using another mail server provider would like to use the same server where site is deployed as mail server.

For same I have installed the all the packages. now am able to send the mails but facing below problem
mail from abc@imedicusinc.com to xyz@imedicusinc.com  working
mail from abc@imedicusinc.com to xyz@gmail.com working
mail from abc@gmail.com to xyz@imedicusinc.com not working(mail get bounce with Host not found 550 error

its looks to be reverse DNS isssue. Can you please help me for how to setup MX record when we are using the same server as mail server.

thanks In advance

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