OTBR: Is mail really getting through

[John Schmerold]

Systems like Nagios do a fine job of making sure that an SMTP server is 
up, however it does not confirm mail is flowing. This morning, something 
was causing Postfix to throw "450 Server configuration problems" 
rejections (I think policyd died), a quick reboot solved the problem.

I want to know about this before the phone rings.

To me: a logical solution would be a program that sends emails every 10 
minutes to itself through a relay, then checks its account via POP3 to 
make sure it got the message. If it doesn't get the email with 5 minutes 
it starts alerting me through SMS, fax, phone call whatever.

Anyone know of such a beast?

BTW: OTRB is OT But Related