[exim] trouble sending remote mail

Hi,

Exim on my server has started hanging while trying to send emails, and I'm
at a loss as to how to debug why this is happening, but it's keeping the
darcs mailing lists from functioning, as it's happening on my server. :(

When I try to run

exim4 -d+all -M 1GcASA-0001tc-Sq

where this is a message ID whose process I identified with exiwhat and
killed, the job hung repeating

21:34:40 23041 read response data: size=24
21:34:40 23041 SMTP<< 220 Ready to start TLS
21:34:40 23041 initializing GnuTLS as a client
21:34:40 23041 generating 512 bit RSA key...
21:35:40 22912 selecting on subprocess pipes
21:36:40 22912 selecting on subprocess pipes
21:37:40 22912 selecting on subprocess pipes
21:38:40 22912 selecting on subprocess pipes
21:39:40 22912 selecting on subprocess pipes
21:40:40 22912 selecting on subprocess pipes

where the last bit keeps repeating indefinitely every ten minutes. I can
provide more information if necesary, but as I said, I'm at a loss. Thanks
in advance!
--
David Roundy
Dept. of Physics
Oregon State University