Automatic Follow-up Emails to Non-Openers

A follow-up email automatically re-sends your campaign to the people who did not open the first send. You configure it once on the Review step of the email campaign builder, and the platform handles the resend on a schedule — no second campaign to build.

Before you start#

The follow-up lives on the email campaign builder's Review step, so you need an email campaign in progress with its content and audience already set. The follow-up only ever goes to recipients who did not open the original email, so it does not apply until the first send has completed. Building the campaign itself is covered in Send an Email Campaign.

Turn it on#

1. On the Review step, find the Follow-up email card — its description reads Automatically resend to recipients who didn't open the first email.
2. Flip the switch to enable it. The configuration fields appear only once it is on.
3. Under Create a new subject line, write the subject for the follow-up. It is prefilled with Reminder: followed by your original subject, and the helper text suggests trying something different from your first email.
4. Under Set time delay, enter a number and choose Days or Hours for how long after the original send the follow-up should go out.
5. Finish reviewing and send or schedule the campaign as usual. The follow-up runs automatically after the first send completes.

Every field explained#

• Follow-up email (toggle) — the master switch. When off, no follow-up is scheduled and the fields are hidden. When you first turn it on, the subject line and delay are seeded with sensible defaults.
• Create a new subject line — required when the follow-up is enabled (marked with an asterisk). Defaults to Reminder: plus your parent campaign's subject. A built-in emoji picker lets you add an emoji to the end. The helper text nudges you to make it different from the first email so it stands out in the inbox.
• Set time delay — required when enabled. A number field paired with a Days / Hours toggle. The helper text reads The amount of time after the first email is sent. The default is 48 hours (shown as 2 days if you switch the toggle to Days).

Limits and validation#

• The minimum delay is 1 (one hour, or one day in Days mode).
• The maximum delay is 720 hours — 30 days. The field caps at this value and the note confirms Up to 30 days after the original send completes. In Days mode the maximum shows as 30.
• Switching between Days and Hours only changes how the number is displayed — internally the delay is always stored in hours, and switching preserves a sensible equivalent (for example, 48 hours reads as 2 days).
• Entering a value below the minimum or above the cap is ignored, so the delay always stays within range.

How the resend actually happens#

When you enable the block, the settings are saved with the campaign as its follow-up configuration — the enabled flag, the delay in hours, and the new subject line. After the original campaign finishes sending, a background job named campaigns:process-followups waits for your configured delay to elapse (measured from when the first send completed), then dispatches the follow-up to everyone who did not open the first email. You do not need to trigger anything manually.

Good to know#

• Only recipients who did not open the first email receive the follow-up — anyone who already opened is excluded automatically.
• The follow-up reuses your campaign's email content; the one thing you change here is the subject line.
• You can turn the follow-up off at any time before the campaign completes simply by flipping the switch back — the fields and the scheduled resend are removed.