邮件无法relay？
From: System AdministratorSent: Thursday, January 31, 2008 9:35 AM
To: user
Subject: Undeliverable: subject
Your message did not reach some or all of the intended recipients.
Subject: subject
Sent: 1/31/2008 9:35 AM
The following recipient(s) could not be reached:
user@abc.com on 1/31/2008 9:35 AM
You do not have permission to send to this recipient.For assistance, contact your system administrator.
<server#5.7.1 smtp;550 5.7.1 Unable to relay for user@abc.com>
很奇怪，abc.com和abcxyz.com都用一个connector,发到abcxyz.com的都正常，发到abc.com的都出现上述问题
会是什么引起的？
谢谢
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