Question about tcpserver program

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Hi all! This is Heepok who managing qmail server on Solaris. By the way I have a question about Tcpserver program. If I use this program to selective relaying, how other mail servers can send mail to this server? For example On server mail.a.com when I configure a smtp.cdb like this, 192.168.:allow 192.169.:allow   how [EMAIL PROTECTED](mail.bora.net-164.124.116.3) can send mail to [EMAIL PROTECTED]? I think mail.a.com will refuse connection from mail.bora.net. So mail.a.com will not receive any mail from other remote servers. Could you explain how I can solve this problem? Thank you!