shawfactor

This plugins allows you to have a configurable list of html elements and html element attributes that will be removed from the content of posts,pages, and custom post types when they are saved.

LH HTML Cleaner

Removes blacklisted html tags and attributes.

ericjuden

Ever need to send your home page as a newsletter? This baby takes your home page’s HTML/CSS and cleans it up to work with different email clients.
The main way of doing this is by removing the embedded styles and making them inline styles.
This plugin generates the html to use in your newsletter application.

Newsletter Converter

Ever need to send your home page as a newsletter? This baby takes your home page's HTML/CSS and cleans it up to work with different email clients …

LH HTML Cleaner vs Newsletter Converter