Based on Sidekick emails research (6.4 million one-to-one emails sent through Gmail, Apple Mail, or Outlook). Here are 6 common words influence 1 to 1 email open rate.

Let's see!

Open rate

65% Weekend

59% Weekday

 

Emails with "You" were opened 5% less than without "You".

Emails with "Free" in the subject line were opened 10% more than without "Free".

Emails with "Quick" in the subject line were opened 17% less than without "Quick".

Emails with "Tomorrow" in the subject line were opened 10% more than without "Tomorrow".

Emails with "Meeting" in the subject line were opened 7% less than without "Meeting".

Emails with "Fw:" in thesubject line were opened 17% less than without "Fw:"

Emails with no subject all together were opened 8% more than without subject line. 

Source: MarketingProf