Okay, this is annoying. Some time yesterday my incoming email at this site stopped working. I received a bounce from my work email address saying Deferred: Connection timed out with magahiz.com. I can send email locally just fine, so my email form still works fine, though. No sign of trouble in the maillog either.
From my intranet, I can telnet to port 25 on my server and talk to sendmail. It's a little trickier to come up with a telnet from the WAN side to see whether the routing is working properly. Eh, maybe it's something on the Linksys router. I'll try rebooting that to see what happens.