Did you observe that Edaboard blocked a post or an attachment of yours before? If a specific content e.g. an attachment is (possibly erroneously) recognized as virus, the Edaboard firewall may block the IP after multiple attempts to send it to the server. If it's a dynamic IP, restarting the router (and getting a new IP) will probably solve the issue. Otherwise an Edaboard server operator (don't know if all administrators have the capability) has to unblock the IP. Sorry for inconvenience.