[imp] internal server error

[Adam Tauno Williams]

> > I forward that email that raises an internal server error on my  
> > horde 1.2.4 install. Apache's log show that message:
> > [Wed Sep 23 15:12:24 2009] [error] [client 82.240.99.84] Premature  
> > end of script headers: message.php, referer:  
> > http://ns36227.ovh.net/horde/imp/message.php?mailbox=INBOX&index=1135
> > Can one discover the reason of that ?
> No, since this error is outside of Horde. My first guess is a buggy  
> c-client version.

I had the IMAP connection blowing up the memory limits on my new CentOS
server;  upgrading PHP fixed the issue.  Sometimes /var/log/messages
will say something more helpful, and configuring PHP error logging helps
too.