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.

The seed list feature in Blueshift requires you to upload a list of users (for example, internal users), and subsequently use it in a campaign. When the campaign is launched, it sends a copy of the first message to each user in the seed list.

The seed list behavior for different types of campaigns is as follows:

One-time campaigns First message from the campaign.
Recurring campaigns First message for each run.
Segment triggered campaigns running daily First message every day.
  • Event triggered campaigns
  • Segment triggered campaigns running continuously

Seed list sends are based on the following conditions:

  • Seed list sends are triggered when a message is successfully sent to a customer from the given campaign.
  • There have not been any sends to the seed list from the campaign in the last 6 hours.
  • For an ongoing campaign, sends will be made to the seed list every 6 hours.

Example 1: A campaign is launched at 2 AM, and sends a message to a customer. Seed list sends are triggered at 2 AM.

Subsequently, the next time a customer qualifies for a message is at 10AM. Hence, in this case, the seed list sends will be triggered at 10 AM instead of 8 AM.

Example 2: A campaign is launched at 2 AM and the first time this campaign messages a customer is at 3 AM. Hence the seed list sends will be triggered at 3 AM.

Example 3: A campaign starts at 2 AM and sends a message to a customer. Seed list sends are triggered at 2 AM.

You then pause the campaign at 3 AM and restart it at 4 AM. Since the last seed list send was at 2AM, the next seed list send will be triggered no earlier than 8 AM.

Set up seed lists

  1. Follow the same Customer List setup process but select "Seed list" as the option.


  2. Associate the Seed list to use with the campaign in the Monitoring section of the Properties tab for the campaign.


Subject lines for seed list emails

The Subject line for an email sent to the seed list has the following format:

  • Seed List - {$original subject line} : ( {$seed list name}, {$customer email address} )
  • BCC - {$original subject line} : ( {$customer email} )

For example, if the Subject line is "Best scooters in town", the customer email address is 'firstname.lastname@company.com' and the seed list is 'Default Seed List', the subject line has the following format:

  • Seed List - Best scooters in town: (Default Seed List, firstname.lastname@company.com)
  • BCC - Best scooters in town: (firstname.lastname@company.com)


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