dodocrypto
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i have created a guide to use sendgrid as smtp relay using centos 8 and postfix

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More Posted time:Feb 5, 2020 19:56 PM
By default Alibaba Cloud Block Out going port 25 . We need to setup smtp relay for it.
Since opendkim is not available yet in centos 8 , i left out the tutorial for dkim and dmarc

https://dodocrypto.com/index.php/2020/02/05/centos-8-rhel-8-configuring-postfix-mail-server-with-sendgrid-relay-spf-and-dkim/
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