Dallas-based Zix is buying email security provider AppRiver and in doing so it is making a massive push into the channel, increasing the number of its partners 10-fold with the stroke of a pen.

Zix, a Dallas-based provider of secure email and backup services, said it is buying AppRiver for $275 million and in doing so is expanding the number of its partners from 400 to 4,000 in a big ...