Multiple Recipient mail + disabled messages

I was trying to send a PM to three people at the same time but one had PMs disabled, so it would not go through for anyone.

I tried removing the disabled user from the recipient field and re-submitting but it wouldn't work either, the page refreshes and the field looked un-edited.

It might have gone through but said otherwise, I am not sure, but if so I just spammed a couple people by accident lmao.