Mail server problem

I’m currently getting this error on checking mail (Thunderbird):

Sending of password did not succeed. Mail server mail.xxxxxx.com responded: les: fatal: unable to parse this line:
4.228.204.63:allow,RELAYCLIENT=“”,RBLSMTPD=“203.101.40.72:allow,RELAYCLIENT=”“,RBLSMTPD=”"

(IPs are Level 3 and Bharti Infotel)

The error is occuring on more than one PC.

Working okay now… strange error, though.