2021.2

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537).
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": [
"dogs",
"animals",
"pets",
"mammals"
]
};
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