Extensions: Send mails with custom headers with firestore-send-email extension

[giammin]

Extension name

firestore-send-email

What feature would you like to see?

the ability to add custom header in a mail

How would you use it?

We use Mandrill API to send emails and we can add some custom metadata to every message.

We can also add metadata sending email with Mandrill smtp but we need to pass them in the X-MC-Metadata header.

It would be great if we can specify in each message and at template level some headers to include in the message

[Ehesp]

Thanks for the feature request. I'll pick this up internally & figure out how/if this can be integrated.

[dasmeet]

Hi

Would love to have this feature. Am using SES but can't even enable basic SES open and click tracking without custom header.

[karayu]

This looks like it's covered by #108