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1. Not More Than Three or Four Words, Keep It Short
The subject line of cold email should not be more than three or max four words. Short subject lines are easy to read or scan.
2. Add Some Warmth
Pretend you are writing a note to your old- time college buddy, not the title of your upcoming blog post. Make sure your subject line is both conversational and casual, conveying a personal touch.
3. Stay in Sync With The Email Content
Your subject line should be preview of the email content.
4. Communicate Authenticity
Including the name of the recipient or some specific keyword , for example in the subject line makes the sentiments feel real. Personal subject lines deliver much better open rates.
5. Expressing A Single Thought
It is very important to be single- minded while drafting the subject line. Forcing more than one thought into the subject line will make it long and confusing.
6. A/B Testing
There is no formula for a perfect subject line. Regularly tweaking the subject line and testing the changes with different recipients will only result in better open rates.
7. Address An Issue Or Suggest A Solution
Before approaching the potential client, do some research about his or her work. Proposing an apt solution for the client’s current problem in the subject line will certainly increase the chances of getting some clicks. source: http://blog.videofruit.com/subject-line-will-get-cold-email-opened/