2019.2

Note
Sendgrid strips out their mail headers. The results need to be verified via their
Dashboards (e.g. the Stats section lets you verify the stats for specific categories).
Alternatively one can use their Web API to retrieve stats in JSON format. To view the
category stats, log in to Sendgrid and choose: Stats > Category Stats > your category
name.
MailGun
Dashboard: https://mailgun.com/cp/stats
Documentation: https://documentation.mailgun.com/api-sending.html#sending
Add a name meta tag with the value X-Mailgun-Tag and set its content (for example: invoices).
You can make this setting in the Email section properties (see "Meta information" on
page185).
Alternatively you could write a Control Script, for example:
merge.context.sections["Content"].addHeader("X-Mailgun-Tag",
"invoices");
You may specify multiple categories, as follows:
var headerObj = {
"category": [
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