[Dovecot] problems with auth protocol

[Giorgenes Gelatti]

Hello there,

I have a client connecting to dovecot and comunicating like this:

* OK Dovecot ready.

* AUTHENTICATE MYAUTH
+ base64 challange
base64_response {NNN}

* NO Invalid base64 data in continued response


The problem is that dovecot seems to reject the response because of
the {NNN} in the end of the string.
If I remove the {NNN} it authenticates just fine.

Any idea of whether it's standard or not?

Thanks you.