CustomMailer Enterprise Edition Description:

CustomMailer is a powerful, easy-to-use tool for sending customized email using mailing lists. Its unique macro-enhanced mail merge beats merge-only mailers at tailoring messages. Filters, tools, and rules let you precisely target recipients. Supports file attachments, HTML mail, mailing list tools, address verification, flat file and SQL databases, setup wizard, SMTP Authentication, and more. Quick and user-friendly!

Three versions of CustomMailer are available:
Personal Edition - Mailing lists up to 300 names (file only)
Business Edition - Mailing lists of any size (file only) + attachments
Enterprise Edition - Mailing lists of any size (file or SQL database) + attachments + multi-threaded send + direct send