If you're replying to a PM sent to you it should just work with no delays, though I expect you'll find you're limited in the number you can send in a day - probably three
That's why I'm asking.
A user sent me a msg. I wanted to ask a forum helper for advice and he sent me a reply. I tried to reply and got the spam message.
I replied to the user, he sent me another message, and when I tried to reply I got the anti spam message.
So I tried PMing DavieM, and got the anti spam wait 12 hours message, a hence I'm here. The other parties will probably see this convo. It might like I'm talking out of turn.
If you can send me a PM I can maybe ask you and maybe redact this posting.
Don't worry, it's not anything important.