Sometimes happen to receive spoofed email, it could be very useful implement in wordclient alongside the sender a label (like gmail) where there is wrote by the remote server of the sender...I hope I was clear :)
Thank you for sharing your ideas with us to show “via hostname” when viewing a message and the domain of the hostname does not match the domain in the From header. It will be considered for future versions.
Here the screenshot
I sent a message to myself using the link you provided. I received the email just as you described, but I'm not understanding what changes you would like to see included in WorldClient. Any additional details you can provide would be greatly appreciated.
I will try to explain with an example:
if i'm going on this site https://anonymousemail.me/ and i spoofed the email of John From: firstname.lastname@example.org To email@example.com, in the webclient of gmail i see sender firstname.lastname@example.org by orbit.eternalimpact.info if the sender was trusted the message doesn't appear.
I hope I was clear...