Attila Nagy writes:

Are there anybody who could make WP8 (and W10 desktop clients it seems)
devices working with Dovecot's POP3 server?

The conversation looks like this:
S +OK ready
C CAPA
S +OK
S CAPA
S TOP
S UIDL
S RESP-CODES
S PIPELINING
S AUTH-RESP-CODE
S USER
S SASL PLAIN
S .
C AUTH
S +OK
S PLAIN
S .
C AUTH PLAIN
S +
C <base64 auth string)
S +OK[space]
C USER username
S -ERR unimplemented

First I thought the extra space after that OK causes this, but removing
it changed nothing.

So these devices try to log in with AUTH PLAIN, then even after a
successful login they want to log in again with USER, which gets rejected.

I dimly remember some Windows clients preferring either "LOGIN" or "PLAIN"
style mechanism.  Have you tried allowing "LOGIN" style authentication?

        auth_mechanisms = plain login

Joseph Tam <[email protected]>

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