We are interested in getting an outside service to do round-trip monitoring of 
our mail servers (i.e. check that SMTP mail is flowing in and out and send a 
notification if it isn't). [We are not interested in services that send an 
email to one of our mailboxes and checks it with POP or IMAP.] Can anybody 
recommend some commercial services I can check into?


Larry M. Rosenbaum
Oak Ridge National Laboratory

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