I want to use postfix as send only smtp without any third party relay such as gmail :- https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-postfix-as-a-send-only-smtp-server-on-ubuntu-16-04
But many cloud providers block port 25. Is there any way to make work postfix on port 587?
Tried editing postfix configs but not worked.
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