[Dovecot] Restrict Imap access

[Sergiu Zaharia]

Hello. I need to restrict access to IMAP ports to a few users, so that all users can use POP3 and just a few of them will be able to access IMAP.
I use secure connections POP3s and IMAPs. Is it possible?

Also... When I connect to the Dovecot server using Outlook (IMAPs) I get a Warning message,something like:
"The server you are connectiing to uses a non verified protection certificate.
A chain of certificates ...so on ( I can't translate :) )
Continue using the server? "
How can I fix that warning?
Thanks
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