Test SMTP is a command line tool which can be used to diagnose faults with SMTP servers. This self contained tool, which should not require installation on either Windows or Linux platforms, can be run from either a sending SMTP server or receiving SMTP server to reveal many of the common misconfiguration and faults which interrupt mail flow.

Depending on your command line parameters Test SMTP will check the MX records for a domain, PTR (rDNS) records (and that they are not formatted in a way that would trigger anti-spam solutions), check the IP of the SMTP server against DNS Black/Block lists, confirm the SMTP server is accepting connections, is not an open gateway and, if an email address is supplied, that the destination mailbox is available.

Usage: testsmtp [OPTION] [EmailAddress | SMTPServerIP | SMTPServerDomain]
Options:
-dnsbl Do not check DNS Black Lists
+dnsbl Comma seperated list of DNSBL servers to use
-ptr Do not test PTR record for SMTP Server
-sptr Do not report suspect PTR records
-gateway Do not test gateway status
+d Domain to test
+ip IP of SMTP Server to test
+port Port to connect to SMTP Server (Default 25)
-v Show version information
-? Show this help text

Please Note: This software is free for personal, non-commercial use.

The license of this software is Freeware, you can free download and free use this server monitoring software.