Mailgun – Adding Custom Header Values

TODO Add tag references and link.

https://fmforums.com/topic/107362-adding-custom-header-values-for-mailgun/

EmailSetHeader( “X-Mailgun-Variables”; “{” & Quote(“CAMPAIGNID”) & “:” & Quote(“PFY20201216”) & “}” )
SETS: X-Mailgun-Variables: {“CAMPAIGNID”:”PFY20201216″}

EmailSetHeader( “X-Mailgun-Variables”; “{” & Quote(“TARGETID”) & “:” & EMAILS::UserID & “}” )
SETS: X-Mailgun-Variables: {“TARGETID”:154768904323}