Dear all, Did anyone ever had a problem that some emails from specific domains were always been bounced back. These domains can received email sending from our server. But they can't send email to us. Some domains will get a error message but some domain will receive nothing ( the email is gone without any notice). I'm using ISA sp1 ( I using the first version sp1 last year. Then I found lots of mail been bounced back. Then I using newest sp1, it fix some domains' emails. But not all of them. My email server is Exchange 2k with sp2 and Win2k server with sp3. Thanks! Martin Chen Tel: 886-2-8227-1669 ext 2202 Fax: 886-2-8227-1690 Email: <mailto:martin.chen@xxxxxxxxxxxxx> martin.chen@xxxxxxxxxxxxx MSN messenger: <mailto:martinhr@xxxxxxxxxxxxxx> martinhr@xxxxxxxxxxxxxx