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How to test IMAP/SSL user authentication

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This FAQ describes how to test an IMAP user login for a server with SSL enabled using cleartext authentication.

Make an imap connection:

openssl s_client -connect mail.domain.tld:993

At the prompt enter “01 login” with your username and password:

01 login <username> <password>

When done, issue:

02 logout

Reference: Link