SMTPit Pro 4.5.3 from Comm-Unity Networking Systems has been unveiled. It includes an important bug fix for the FileMaker email plug-in that lets you send simple text-based messages or complex HTML messages.

CNS is also reminding past SMTPit Pro license holders that the offer for a free SMTPit Pro Server license when renewing any license for 10 users and above will be expiring on March 2.

SMTPit Pro is available immediately at http://www.smtpitpro.com/ for both Mac OS X and Windows. Prices range from a Single User License for US$65 to a “World License” for $1095 (which includes a free Server License). A Server License of SMTPit Pro for use with FileMaker Pro Server/Server Advanced is $595. A Developer’s License of SMTPit Pro is $1295.