Problem with Squirrelmail 1.4.0 and cyrus 2.1.13

[Andrew Farmer]

Hi all,

I'm just setting up squirrelmail 1.4.0 and I'm having trouble 
authenticating against our Cyrus (2.1.13) server (RedHat 7.2). The IMAP 
server is set up to use "sasl_mech_list: PLAIN" and I have been able to 
login using various email clients with no problem.

However, when I try to login using Squirrelmail, I get: "Unknown user or 
password incorrect.".

I see no errors in auth.log but I do get the following in my 
/var/log/messages file:

Jul 16 15:34:17 mailhost  imapd[30587]: badlogin: mailhost[127.0.0.1] 
plaintext  invalid user

It looks to me as if Squirrelmail is trying to use the LOGIN mechanism 
(which appears to be unsupported), in which case, do I need to recompile 
my cyrus-sasl to inlcude LOGIN support? Or is there something I can do 
in the Squirrel PHP code to achieve a login?

I'm sorry if this is all basic stuff, I'm new to all this.

Many thanks,

Andy Farmer