Ken Moffat wrote: > Gary wrote: > >> >> In short, you have not properly closed down your MTA, and you are an >> open relay. >> >> >> > How about Pop-before-smtp: > http://popbsmtp.sourceforge.net/ > > Requires imap or pop handshake before smtp. Expires after 30 minutes. > > or maybe SMTP AUTH. > > This doesn't work for incoming mail to local accounts.