A seed list allows you to test where an email will land across different email clients and devices as well as see how your campaigns are rendered in different browsers and email clients.
Until now we have supported seed lists for one-time and recurring campaigns only. With this enhancement, we have extended this feature to event triggered and segment triggered campaigns as well.
To add a Seed List, start by creating a new campaign and click on the ‘Advanced Setting’ icon in the upper right-hand corner of the campaign details section. A ‘Seed List’ drop-down will appear and will allow you to select the desired list you’d like to test. The first message from your campaign will be sent to the seed list recipients when you launch the campaign. If you schedule a segment triggered campaign on a daily cadence (instead of executing it continuously), then a message will be sent to the seed list recipients on a daily basis.
To learn more about the seed list behavior for different campaign types, refer to this document.