On 04/28/16 21:27, Joseph Tam wrote:

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

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

Yes, the effect was the same I remember.