Unfortunately anything starting with "X-" is non-standard and mail senders/recipients are free to handle it as they like.
Also unfortunately there's not a great way to 'force' the type. I created an 'enhancement' issue for it with #142 if you feel like tackling that or have a better suggestion :)
Unfortunately anything starting with "X-" is non-standard and mail senders/recipients are free to handle it as they like.
Also unfortunately there's not a great way to 'force' the type. I created an 'enhancement' issue for it with #142 if you feel like tackling that or have a better suggestion :)