azakero Hey heavygale and @tbrummell , it is working now. I removed the extra MX records. Thanks to both of you. But can you please take a look at this other issue which I posted but got no answer? I badly need that for my Contact Us form. https://community.mailcow.email/d/1179-unable-to-send-via-smtp-but-sendingreceiving-via-sogo-works