On Sun, 2002-08-04 at 20:59, Joel Soete wrote: > Remote MTA lightning.swansea.uk.linux.org: network error > > > - SMTP protocol diagnostic: 554 SMTP service not available (failed to > find host name from IP address) Its one of the antispam tests. Your IP address doesnt have a reverse DNS entry so it regards it as dubious. Probably a slightly excessive test. I've turned it off for a bit to see what happens