5. Test all results
Don't just use open rates to test the title. Sometimes, email may have a low open rate but will have a very high conversion rate. Maybe a lot of people are not interested in your information, but a group is interested in it and this group will open, click, and buy. If you know this, you will take subdivision with the masses, send product information to those who opened the mail and send other information to the rest.
6. Avoid use specific words
Absolutely do not use capital letters in the title, and don't use exclamation points. As long as your content is true and does not look like spam, most customers will respond. Junk words such as "duty free" and "sex" must be excluded. But some of the words that are not in the spam words list would also significantly reduce the rate of title reaction, such as "help", "discount" and "reminders".7. Do not use a newsletter issue or version number Disputes or the version number is useless to readers, it does not explain the content of any message. You might as well use the space to tell the readers what's new you wrote in the message. 8. Occasionally test with expiration date In mail, you can use the emergency or due date. For example, in the message written on Monday "5 days left", and then on Thursday went on to write on the message "only 24 hours left". These titles are without any problems, but don't let it become a habit to always use an expiration date. Subscribers will soon get bored of senders who always let them out of breath. SOURCE Soobest.com