Don't Flag Some Errors During Preview Mode

Previewing a post or private message should ignore certain errors. Those errors should only need to be fixed on submission (and possibly saving as a draft).

For example, I use Norton Identity Safe, which includes a form filler. When I go to send a Private Message to a user on phpbb.com by clicking the PM link in a post, the To entry field gets filled in with my user name. After typing the message in, I try to preview it and get the error message "You tried to send a private message to too many recipients." I have to clear the To field out, then preview it again. If I want to make more changes, I have to clear the field again (and repeat until I decide to send the PM).

There is no reason to display that message to me until I try to send the PM. In fact, the message is incorrect, because I have not "tried to send a private message" yet; I'm just previewing the message The fix seems obvious: Add a check so that certain error messages are not shown until the user tries to submit a post or send a PM.