Did you know you can create a segment of people who did not open your email and send them the same email with a different subject? This will increase the open rate immediately!
MailChimp:
Step 1: Replicate an already send campaign
Step 2: Click on ‘Edit Recipients’
Step 3: Select under Segment of Tag ‘Group or new Segment’
Step 4: Select the people who didn't open your previous campaigns or another group you what to target
Step 5: Send the email again with another subject
Pro tip: automate your emails and MailChimp will send them at the best time!