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When I'm doing IMAP authentication of one the public email servers and login is successful I believe, it replies like this:

* CAPABILITY IMAP4rev1 ID XLIST UIDPLUS UNSELECT MOVE LIST-STATUS

There's no OK as you can see, neither a TAG value. However, according to this https://www.rfc-editor.org/rfc/rfc3501#section-6.2.3 they should be included always.

Why?

In case of unsuccesful login, it replies like this:

TAG_2 NO [AUTHENTICATIONFAILED] Authentication failed

which makes sense.

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  • Can you share what is the public server?
    – Anthon
    Commented May 24, 2016 at 5:50
  • @Anthon, mail.ru
    – Oskar K.
    Commented May 24, 2016 at 8:05

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