When viewing a message as HTML which has
mailto:email@example.com as a text string (not as a
link!), this text is replaced by
/firstname.lastname@example.org. This is
ofcourse fine if this is inside a HTML href attribute,
but if this is just the plain text this is wrong and
the text mailto:email@example.com should remain displayed
(and turned into a link preferably).
Easily reproducible by sending yourself a HTML mail and
typing mailto:firstname.lastname@example.org somewhere in the text.
This occurs at least in latest DEVEL tree, haven't
tried stable yet.