When you are clear with the fact that email marketing will help you in expanding your business and when you put up all your creative ideas and worked for hours in getting your segmentation strategies set right in crafting a killer email copy. Then do you think that this amount of work is enough for expanding your business scale? Yes. But neglecting the email subject line part will bring you down the line by landing your newsletters in junk or spam folder. Email subject lines are not only the ...

Yes, you are allowed to add custom fields to your email subject lines, just make sure that you add proper place holders like [FIRST_NAME] in the email subject lines and it will be replaced after you send email newsletters.