On Tue, 08 May 2012 19:47:39 +0200 Jonas Eckerman wrote:

On 2012-05-08 15:22, Frank Elsner wrote:

[About exim authenticating PLAIN and LOGIN against dovecot auth socket]

...

PLAIN Authentication works perfect, LOGIN gives

...

2012-05-08 15:08:43 login authenticator failed for xxxxxx.tu-berlin.de [130.149.X.YY]: 435 Unable to authenticate at present: authentication socket protocol error

This is just a guess since I'm not too good at dovecot, but could it be that you need to set at least "auth_mechanisms = plain login" your in dovecot config?

Yeah, that was it! You made my day!

--Frank Elsner