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For Linux and Shell scripting.

How to changed source SMTP IP address in postfix.

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Follow the steps below if you want to change source SMTP IP address in Postfix.

Modify the variable smtp_bind_address in /etc/postfix/main.cf

If it’s not present, just add it.

smtp_bind_address = IP Address

Then service postfix reload

Make sure you reload postfix. Restart, stop/start may not work :(.

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