Businesses have been using email and text messages for years as part of the marketing mix. Text (both SMS and MMS) and email are still incredibly effective, but as technology and the regulatory environment continue to change, it’s always wise to review best practices. What once worked well may need to be tweaked to continue yielding high returns (and to stay in compliance with increasingly stricter regulations). Here are four ways to make sure your email and text marketing continues to pay off. More.