identd/AUTH for SMTP Mail connections

Hi I have a lot of mail servers trying to connect to my identd port (113) when sending mail to me. <Quote> The problem comes about because the firewall silently drops the SYN packet. The e-mail server is expecting an immediate SYN-ACK (identd supported) or RST (identd not supported), but when the firewall drops the packet it keeps trying until the connection times out. http://www.robertgraham.com/pubs/firewall-seen.html#slow-email <Quote> How do you reconfigure the firewall to RST all those connections the incomming smtp requests on the identd port (113) using "pchains". Thanks in advance Steven