Portable Test SMTP A command line tool which can be used to diagnose faults with SMTP servers
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Portable Test SMTP Description

Portable Test SMTP 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. With Portable Test SMTP you can perform a variety of tests and thus check errors and configuration faults on a SMTP server. NOTE: This software is free for personal, non-commercial use.

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