"no such host" in web server error log

[Evans, Tim]

New imp/horde installation on a Cobalt RAQ 4i with CMU Cyrus imapd server.
PHP 
working with no problems.
 
Users attempt to login to webmail, but are returned to the login screen.
This
appears in the Apache error log:

<br>
<b>Warning</b>:  No such host as foo.com (errflg=2) in
<b>/home/sites/site1/web/foo/horde/imp-2.0.10/lib/imp.lib</b> on line
<b>0</b><br>

Obviously, this is literal HTML markup, a strange thing to see in a web
server log.

I've looked at the imp.lib file, and don't see anyplace that would seem
appropriate for the hostname.

Pointers appreciated.
--
Tim Evans, T.Rowe Price Investment Technologies	| tkevans@troweprice.com
11550 Cronridge Drive, Owings Mills, MD 21117
410-345-3174; Pager: 800-946-4646, PIN 1716638; FAX 410-345-3030