Facinating sysadmin story about the email that wouldn’t go more than 500 miles:
But then I tried to send an email to Memphis (600 miles). It failed. Boston, failed. Detroit, failed. I got out my address book and started trying to narrow this down. New York (420 miles) worked, but Providence (580 miles) failed.
I’ve actually run into the cause of this particular problem before, but without the facinating results.