Use A/B test feature in the 'Add details' section of the campaigns to find the subject line which works for you.
Here's how its done:
Step 1: Start creating the new campaign and select the template.
Step 2: Click Next, and move to the Add details section.
Step 3: In this section,
- Add Campaign Name,
- Add Subject line
- Click on the '+'icon on the right to add another subject line for the campaign.
This way you can add as many subject lines you wish to test for this campaign.
- Add Pre-header to inform more about the email.
- Add Sender Name to let your contacts know who is sending the email.
- Add email address in Reply to, to get your contact's replies on the email.
Step 4: Select the relevant sender Id and Click Next to complete the campaign flow by selecting the list and finally setting it live.