Hi banditone. If you can be a bit more specific about when this error occurs then I can help.
You obviously can post messages as you have one above which came out fine. If you get this error message at the login stage then your user name or password are incorrectly spelled, but again you must have been logged in to post your message.
If you are trying to send an email to a member who has not ticked the “Allow forum members to send you email” box when registering, then you will get an error. We respect each person’s privacy and try to protect members from unsolicited emails (spam) where possible. We ask that you contact them first through a message on this site if required. You can then obviously exchange email addresses, or that person may enable the sending of emails through the site for any length of time.
Hope this helps.