Tension Software (www.tensionsoftware.com) has updated AutoMailer for Mac OS X to version 2.4.
The app allows you to send personalized emails to multiple addresses, in text or web format, each merged with data from an internal database. You can prepare and send an unlimited quantity of emails with a single click. Version 2.4 provides an improved mail send engine and enhanced asynchronous operations.
AutoMailer requires Mac OS X 10.10 or higher. It costs $20 and is available at the product website and the Mac App Store.