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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:


The original answer from 2011 is outdated.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 ...


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

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