The plugin’s author, Shamim, has been in touch to try and resolve the problem. I don’t know whether language difference is an issue, but I have been unable to figure out what went wrong. The code isn’t commented, which makes things harder.
It only seems fair to add that FEP does work. It sends messages and emails recipients. Multiple malware scanners found no issues with it: it seems to be secure.
Quite a bit of fine-tuning is needed to make it look nice and to exclude certain levels of user from the service. Doing this was okay: it’s an inexpensive plugin, I expected some extra work.
The unavailable function I needed was to select multiple recipients from the list (‘directory’). If you already know the names of all your members, it’s fine – there’s an autocomplete field on the new message page, which accepts multiple values. It should’ve been a piece of cake to post a multiple selection from the directory to the message page, however it wasn’t. I fully accept that my PHP is rusty, but it still wouldn’t work even with Shamim’s advice.
It’s quite likely they will fix this function in the pro version. I hope so – and trust that Shamim will update this listing when they’ve done so.