Sending mass emails - Newsletters
===

I have many customers who want to send them newsletters to its users.

I need to know the best way to do this service:
- Programming with PHP and PHPMailer?
- Using a tool such MailChimp, Campaing Monitor?
- Using libraries like http://www.phplist.com/?
- Using http://www.sendblaster.com/?
- Other?

What is the best way to do it?

It would be important (in the face of usuariois) the possibility of how Multilanguage, because users are Spanish, and have no knowledge of English.

Hope you can help me.

A greeting and thanks.

**Javier**