It has now been a number of weeks since we first released the Email Marketing Sending Engine beta and the response has been great. Overall we are finding increased sending speed (more than double the speed in many cases) and few problems.
The couple minor problems found have been worked out and we are now ready to release the first release candidate. If all goes well we should be rolling this into the general distribution in the near future as the default sending engine.
To use the release candidate sending engine:

  1. Upgrade to the latest version of Email Marketing
  2. Open your /12all/admin/ file
  3. Put the following code in a new line right above the line that has “?>”
  4. Your Email Marketing installation is now using the beta sending engine.

You can also find some article to help you make sure your messages are delivered here: email deliverability. Let us know if you have any comments!