2. Pick an interesting subject line

The subject line creates the first impression of your e-mail. If it isn't intriguing enough it's most likely not going to be read and probably just straight to the trash. 

to understand the interests of your subscribers, refer to data analytics and this will guide you on how to phrase your subject lines. 

Don't forget to add a tad bit of personalization. Research showed that there is a 58% increase in revenue when you send out newsletters that address them by their first name.