We've had a rash of machines on the wireless network infected with spam bots and such. We've change our mail relaying ACLs to require that folks sending mail through our smtp.umbc.edu relay from the wireless be "authenticated" in the same way that external IP addresses are, this means they must either:
- Use SMTP AUTH
- Have used IMAP or POP to read mail through the imap/pop.umbc.edu servers within an hour before attempting to send.
or