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?
Thanks, Larry M. Rosenbaum Oak Ridge National Laboratory
