smtp in Network Monitoring downloads
Folder Watchdog Service
1.6.5 download... logged in plain-text files (added in version 1.1) SMTP authentication for outgoing email configuration may be exported to and imported from a text file SQL logging is available on request. ...
PRTG Network Monitor
17.2.30 download... NetFlow / sFlow / jFlow. It also offers SMTP/IMAP Roundtrip-Email Monitoring and VMware Monitoring, VoIP Monitoring, Toplists ... for all common network services (e.g. PING, HTTP, SMTP, POP3, FTP, SSH etc.), allowing users to monitor ...