I learned this trick from Alex Berman whose book “Cold Email Manifesto” I recommend.

How do you get potential customers to open the email?

You need a good subject line.

Luckily this is the easy part.

Out of all the subjects lines tested over thousands of emails, this subject line has outperformed other subjects in testing

Subject: Quick question!

Test it in your campaigns and you’ll be sure to get a high number of opens.

Quick question