You may use SMTP Diagnostics free of charge for 30 days.  SMTP Diagnostics is fully functional in all respects during the evaluation period, but certain features will no longer operate once the evaluation period ends.

In order to continue using SMTP Diagnostics, you must register your copy of the software by purchasing a license.  You can purchase a license from within SMTP Diagnostics or by visiting our website at http://www.smtpdiagnostics.com/.

When you purchase a license you will receive a license key which you register in the trial version.  This removes the trial version limitations.  There is no need to download a second, "full" version of SMTP Diagnostics.

SMTP Diagnostics is delivered via electronic software download.  We do not ship any physical product, and there are no printed manuals for SMTP Diagnostics.