Failure while adding to email domains list

Mail for domain failed! : Missing file to open at main::../ line 4928 at ../ line 823.

System is Debian Sarge, running sendmail. No errors in /var/log/mail.log upon startup about Sendmail misconfiguration. Virtualmin doesn't gripe when it checks it's configs. I've even symlinked local-host-names to just in case.

Closed (fixed)