I can receive emails from qmail but couldn't send out any... I checked my mail logs and found:

Nov 14 17:53:20 server relaylock: /var/qmail/bin/relaylock: mail from 11.22.333.444:37277 (server.domain.com)
Nov 14 17:53:23 server qmail: 1163498003.114915 delivery 708: failure: 11.22.333.444_does_not_like_recipient./Remote_host_sai$

Nov 14 17:53:19 server qmail-queue[11421]: mail: all addreses are uncheckable - need to skip scanning (by deny mode)

11.22.333.444 is my server ip. Why Do I got this error and how to fix it??
Anyone help please greatly appreciate.

Thank you