我的邮件服务器若通过ADSL直接拨号上网，收发邮都没问题，
但是通过ZYWAL2防火墙上网就发不出邮件，有以下提示：
Attempting to send message to gateway.
Attempting SMTP connection to [xxx.xxx.xx.xxx : 25]
Waiting for socket connection...
220 domain.com ESMTP MDaemon 6.7.9; Sat, 07 Feb 2004 19:15:58 +0800
EHLO domain.com
Socket connection established
Waiting for protocol initiation...
250-domain.com Hello domain.com, pleased to meet you
250-ETRN
250-AUTH=LOGIN
250-AUTH LOGIN CRAM-MD5
250-8BITMIME
250 SIZE 0
MAIL From:
SIZE=1445
550 Sorry, is not allowed access from your location
QUIT
请赐教！
