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You had to manually add previous versions of Diafaan SMS Server to the Windows firewall exception list if you wanted to use the built-in SMTP- or HTTP Server from another computer.
In the latest update the exception from the Windows firewall is done automatically on installation. Please note that other firewall software or hardware may still block the Diafaan SMTP- or HTTP server if you do not add Diafaan SMS Server to their exception list.

Version 1.6.1.0 also solves a nasty bug in the processing of email messages from a POP3 server causing multiple SMS messages sent for each received email message.