Hello again, Shamim – can you help me out, please?

I made a form as you suggested, with a checkbox like this: <input type="checkbox" name="fep_mr_to" value="' . $u->ID . '"

Problem is, only one of the selected values is passed to the new message form.
This is because all the checkboxes have the same name!
I tried adding a counter in the foreach, and appending the count to the input name, but then nothing was passed.

I think I need to serialize the selected user IDs, but don’t know to pass an array or list to the action page. I’ve been scouring your code, but am not a WordPress expert so it’s hard to figure out how to manipulate your container “fep_mr_to”.

Have you got some advice for me?
Thanks.