Signing custom headers
Published on April 4, 2016
It now is possible to add DKIM signatures that do not only sign the regular email headers (like the subject, from address, to address, et cetera), but to also sign custom header fields.
This feature has been added to support Google/GMail feedback loops. These feedback loops require you to add a signature that signs the "feedback-id" header - which does normally not get signed. By including the "headers" member in your JSON input, you can instruct MailerQ to sign the "feedback-id" header too.
