Resolve ERROR: Message not send Server Replied : Relay Access Denied

Description: Here we solve the error related to squirrel-mail client and Postfix server. The error we was facing ERROR:
Message not send Server Replied Transaction Failed 554.5.7.1 <email>: Relay Access Denied.

We try to resolve the issue and finally we got the solution of this error.

Solution:

First thing you need to check the hostname of your system.

For this you need give the command:

hostname

Than you need to open the file in your favorite editor we use vim:


vim /etc/postfix/main.cf 

The hostname in main.cf must be as same as you see in hostname.
Check hostname in /etc/hosts 

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