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Using a MS Exchange server 2007 which is running on Windows Server 2007. From the few days I noticed it provides me slow internet. And there is more than 1000 entries in [email protected], I think it may occur for the NDR. The am very with the exchange server, and don’t know how to deal with this problem. I found another issue that is the SPAM attack on my windows.
I had an this type problem in my server, and found it occurs for the server address(host) file. I am giving you the script, check it whether it is matching with your router’s address. If it matches, then sure that there is no problem in your Exchange server. Go for windows firewall.
The script of the host file:
Quote:
220 mail.mydomain.com Microsoft ESMTP MAIL Service ready at Fri, 17 Sep 2010
09:31:03 -0500
ehlo testdomain.com
250-mail.mydomain.com Hello [192.168.1.5]
250-SIZE
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-AUTH NTLM
250-8BITMIME
250-BINARYMIME
250 CHUNKING
mail from:[email protected]
501 5.1.7 Invalid address
451 4.7.0 Timeout waiting for client input
It is an issue like the "backscatter" in SMTP connection, which acts as to filter your spam issues in the windows. Also it is used to generating NDR’s. For the SPAM attack in your windows add the DNS blacklists into your spamfilter, to prevent the machine from SPAM. And configure them with the listed IP’s.
Quote:
zen.spamhaus.org
ix.dnsbl.manitu.net
bb.barracudacentral.org
combined.njabl.org
dul.dnsbl.sorbs.net
bl.spamcop.net
Either reconfigures your scanner to access authenticated SMTP connection. To accept and the relayed as needed. If you are having the AV scanner for your personal emails, it will not send out the mails and gives a message “your message has been blocked”. It will probably go out to the some non-existing mailbox for access your personal mail.