These are the most notable features:

• Can handle huge mailing list (live tested with 30k+ addresses).
• Correctly sets email headers.
• Sends mixed txt/html emails. (pear mail only)
• Remote HTML parsing. This means that Mailing Master can send a webpage with ease as well as a local file.
• Avoids mail server congestion with the power of Ajax. Mails are sent in chunks, a progressbar will show the advancement of the process.
• Compatible with the native mail function and pearMail.
• Supports both csv files and mySql as email lists.
• Easy to use with an existing mySQL database: create a schema or even a custom query to access your data.
• Real email validation (optional). Checks if the domain exists with a dns query.
• Can handle multiple configuration files (set config for different newsletter and change them with a click).
• Logs email results in log files.
• Every single option is customizable.
• ooPHP PHP4 compatible.
• Ajax powered.