When posting to Orchid please send plain text emails by default.
Using fancy formatting in emails can be nice, and all these stationery and letter creations are fascinating. But not everybody can or wants to receive rich text messages.
Some email programs are not capable of rendering the HTML used for rich formatting in email messages. Others try, but fail.
Other recipients might have email clients that can properly render HTML messages, but disabled rich formatting in email for various reasons, mostly purity of the medium, bandwidth issues, security and privacy among others.
If you did send rich formatted message to Orchid, The moderators will manually remove all rich text formatting and attachments before forwarding your post to the group.