You can now publish to your Posthaven blogs via email. Doing this is as easy as sending an email message to post@posthaven from the email address you used to register your account. The subject line of your email becomes the title of your post and the content of your message becomes your post's content - including any images, documents or other files you may attach.
Of course there's a lot more functionality than that. You'll find the details on their Post by Email page. The Posthaven Primer user guide has also been updated to include details on email posting.