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Topic: Mail delivery slow in Docker iRedmail

I have installed iRedmail server using docker. I have given the FQDN for the mail server and the setup is fully done. But while sending the message to another user it is very slow.

Example
test@domain.com sends the message to test@gmail.com, this message becomes delayed. Not only the Gmail others like test@domain1.com, test@domain2.com.

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