2021.1

MailJet
Dashboard: https://app.mailjet.com/dashboard
Documentation: https://app.mailjet.com/docs/emails_headers
To assign a campaign, set a meta tag of the type name with the value X-Mailjet-Campaign and
set its content to the name of the campaign (for example: invoices).
You can make this setting in the Email section properties (see "Meta information" on
page529).
Alternatively you could write a Control Script, for example:
merge.context.sections["Content"].addHeader("X-Mailjet-Campaign",
"invoices");
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