Subject Lines and Preheaders

Updated on 6 Sep 2022

With billions of emails sent daily, how can you stand out in the crowd and not get clicked into the trash? The email subject line is by far the most important factor in a successful email campaign. It’s what determines whether or not people will actually open and read the rest of your email.

We have a great blog on Writing Effective Subject Lines you may want to check out if you're having writer's block. 

But in Simplero we offer a couple of features to help support your subject lines and encourage your open rates. 

We offer...

  1. Preheaders

  2. A/B Split testing

  3. Subject Prefix

What is a Subject Prefix?

The subject prefix is useful to help your customers on your list identify ALL emails you are sending them. Especially if they are subscribed to multiple lists, this feature is going to be your best friend!

For example, your customer is subscribed to 5 different lists. It can become confusing for the customer which lists the emails are from. You'll find adding a subject prefix for all of your future emails useful. 

To set this up your subject prefix...

  1. Select Contacts from your Simplero Dashboard

  2. Select Lists from the dropdown menu

  3. Select the list you want to apply a subject prefix

  4. Select the Configure tab

  5. Scroll down to the Advanced Settings section

  6. Add your Prefix & Footer in the field

  7. Click the blue Save changes button

When you send out an email to that particular list we will automatically add the prefix to your subject line.

A/B Subject Lines

When you first create a broadcast you will have the option to set up split testing of your subject lines. By doing this you can sell a small portion of your recipients your email broadcast split with 2 different subject lines. After a period of your time, that same broadcast will be sent to the rest of the recipients with whatever subject line had more opens. 

Note: If your recipient's for a broadcast is less than 2000 contacts, split testing is not advised as it will not be entirely accurate. 

But we know you've got a large list so let's look at how to do it...

  1. Select Marketing from your Simplero Dashboard

  2. Select Email Broadcasts from the dropdown menu

  3. Create a new broadcast by clicking the red +Create new broadcast button in the upper right corner

  4. Add a Subject line.

  5. Click A/B test the subject icon 

  6. Enter your Alternative subject line

  7. Enter the percent (%) of recipients you want the two emails to send the test to

  8. Enter the number of minutes for how long you want to give the test to run before the broadcast is sent to the remainder of your list


A preheader is a line of text at the very top of your email, which means that it will show up in people's inboxes just below the subject line as the first line of text.


Preheaders are a great opportunity to give a brief summary of what your broadcast, autoresponder or automation email is about, or maybe just to peak people's curiosity. You can start using it in all your emails today by editing the preheader along with the subject line and the body of your emails like you're used to.

For example, you can add a Preheader via the Edit screen in a broadcast. 

  1. Select Marketing from your Simplero Dashboard

  2. Select Email Broadcasts from the dropdown menu

  3. Locate and click on the Broadcast name to edit the email body

  4. In the Broadcast editor page, click the content section located in the header

  5. In the Broadcast Edit screen, enter what you want in the Preheader field

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