dovecot - Apr 2016 - WP8/Windows 10 mail app can't login, tries double auth

Hi,

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.

The only solution here seems to be giving back -ERR to the client's AUTH 
command, which makes it try USER instead.
I'm not aware of any configuration options which makes this possible.

Any other ideas?

Thanks,

On 04/27/16 14:54, Nagy, Attila wrote:
>
> The only solution here seems to be giving back -ERR to the client's 
> AUTH command, which makes it try USER instead.
> I'm not aware of any configuration options which makes this possible.
Or a client workaround option to allow any USER/PASS combination after a 
successful AUTH (however I haven't tried whether the client accepts it, 
or in this phase it's internal state is completely flawed).