[send to :firstname.lastname@example.org/10000 subject "testing mail" text "this is where i desperately want to type a newline and can in version 89!!"]
This is a user-incompatible change! ?:woof<ret> will no longer focus on :woof! It'll just give you:
[focus on :woof
For backward compatibility, a button is provided to control the sense of <return> and <Shift-Return>. The button defaults to <return> meaning terminate command and <Shift-Return> to mean insert a return.
In version 88, an inadvertent <Return> eliminated the message with no hope of getting it back without re-entering the whole thing. However, there was a way around it: Insert a newline in the command buffer by typing ctrl-o ctrl-n, where ctrl-o will 'open up' a new line, and ctrl-n will 'go to the next line' (the empty line you just made).
More on the mailroom..