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Setting up Postfix can be a pain. Here’s the ultimate cheat sheet to setting up Postfix.

For sending you can either use smtp relay with a service like gmail or google apps.

Or you can use dig -x xx.xx.xx.xx to find your PTR record. Whatever domain you’re hosting on your Ec2 instance use this PTR record result for myhostname.

eg

myhostname = ec2-xx…..compute-1.amazonaws.com

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