Some email providers allow you to run A/B split tests on your emails. This is a great way to find out the types of trigger and branding your customers respond to. It’s often tempting to aim for exciting subject lines but more than often simple works better (and does a better job of avoiding spam filters). At the end of the day, testing allows you to see what works best.
There are many things you can test in your emails including:
- Subject line text
- Day of week
- Time of day
- The “From” name
Read this excellent article on email a/b testing written by Mail Chimp.