"Subject: {t.subject} ",
"X-Message-ID: {t.id} ",
"{if:t.replyTo}Reply-To: {t.replyTo:h}{end:}",
- "{if:t.mailgun}X-Mailgun-Variables: {t.mailgun-variables:h}{end:}"
+ "{if:t.mailgunVariables}X-Mailgun-Variables: {t.mailgunVariables:h}{end:}"
))."\n");