Надеюсь, это решит проблему:
SendStudio is a powerful, all-in-one email marketing solution that's
incredibly easy to use and a snap to install. SendStudio handles
everything, from building a list and creating personalized newsletters,
to measuring campaign results and sending automated follow up emails.
_http://www.svetlogorsk.spb.ru/netz/SendStudio.v2004.build.13.08.04.PHP.NULLED-GTT.zip
А если будут проблемы с аттачамиЮ, то xls файлы можно конвертнуть в html формат при помощи этой штучки:
ABC Catalog is an easy-to-use managing
catalogs program that allows you to publish
on your web-site various data such as
products catalogs, price-lists,
specifications stored in Excel tables.
All you need is to select an Excel file
on your local computer and press the [Parse] button.
ABC Catalog lets you adjust look-and-feel
properties of your generated HTML(color and width of table border, font and background color for category headers).
_http://www.svetlogorsk.spb.ru/netz/Abc.Catalog.v2.0.PHP.NULL-WDYL-GTT.zip
Удачи!