PLAIN authentication in Cyrus IMAPd

David G McMurtrie dave64 at
Mon Dec 21 12:05:32 EST 2009

On Mon, 21 Dec 2009, Torsten Schlabach wrote:

> Dear list!
> I am using Cyrus IMAPd 2.2.13 on Debian Lenny. I tried to configure my
> IMAPd to allow PLAIN authentication, even over non-encrypted
> connections. (This is a pure Intranet deployment and I understand the risk.)
> Despite setting the appropriate options in imapd.conf, i.e.:
> sasl_mech_list: PLAIN
> sasl_minimum_layer: 0
> the server just refuses to announce PLAIN as an authentication mechanism.

I think you have to set "allowplaintext: 1" in your imapd.conf and also 
specify your imap service in cyrus.conf as cmd="imapd -p 2" to tell it 
there's an external security layer in place.



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