You need to put a mailing for a customer on the website (in addition to the text, attached documents, it is desirable to add multiple files at a time). Newsletter legal, ie you need to have all the titles was the ability to unsubscribe. Not a lot of people a few hundred people. It is important to have a good simple interface for blondes secretaries :)
There is something decent in PHP, and now I do not want to be distracted by the spelling of his?
The simplest option is the use of mailing services. Of course, not free, but for small amounts this is the fact of price / quality / effort.
Speaking specifically about the implementation, the fit is completely ready for use of the services is not met, the best option that makes a lot of routines for programmers — pecl module Mail