I got a task to set up a mail server which sends mail to outside world but not receive them. I got a sub domain name (for example mail.example.com)but the system exists in local LAN. I tried to use postfix but it was failure. So, please any one provide me step by step guide from setting up mail including configuration to send mail.By the way am using ubuntu >=18 version in virtualbox.

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    Linux e-mail configuration is one of the most difficult tasks. I have prepared a checklist at kadifeli.com/fedon/hint.php?cloud_mailconf that will allow you to create a full sending and receiving e-mail server. You can apply the relevant parts for your task. – FedonKadifeli Apr 25 '19 at 11:40

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