@rysiek Yes, if you open the message and hover over the subject, some extra clickable icons appear to the right.
There's a hammer representing the "message source." That makes sense, right?
@HerraBRE it... kinda does, but I would suggest icons to appear whenever the message is displayed in full. There's a bunch of things that happen on hover in Mailpile and I keep finding myself fishing (no pun intended) around with my mouse to try and find the on-hover locations. ;)
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