Gammadyne Mailer has the ability to send up to 1024 emails simultaneously.  This feature is known as "multi-threading" or "multi-tasking", and can greatly increase the speed of the send operation.

When sending an email, a lot of time is spent waiting for a response from the mail server.  Multi-threading allows Gammadyne Mailer to keep working on another email while waiting for the response.  The improvement in throughput is huge.  Multi-threading allows virtually all available upstream bandwidth to be utilized.

Configuration of Multi-Threading is quite easy.  On Gammadyne Mailer's "Send" branch, locate the "Threads" field and enter any number between 1 and 1024.  When sending email through an intermediate SMTP server, 4-10 threads are recommended.  When performing a Direct Delivery, 20-50 threads are recommended.

Note:  do not use more than 64 threads on Windows 9x/ME.

The screenshot below shows the Multi-Threading feature in action.