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Your question is too broad to answer in our Q&A format! The steps that are needed are roughly: Configure the server to support Active Directory authentication / integration. That is already a topic in itself with several options on how to achieve that: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/...


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The original answer from 2011 is outdated. Dovecot lifecycle announcement: For any version before 2.2, we are not going to be providing any patches or fixes. This has been the case before, but we are now officially declaring them EOL. I will still list all versions for reference. Sometimes admins have to run software they'd rather not run. dovecot ...


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Contact your VPS provider. They have blocked outgoing mail on your server.


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