Yes.. It is spoofing user@ourdomain.org We currently run GFI mail essentials.
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SPAM - Your message did not reach some or all of the intended recipients.
Hello,
Some of our users are receiving a large number of emails from the system administrator reporting "Your message did not reach some or all of the intended recipients. " .
I realize these messages are spoofing the From: address in the email header. However, is there a way stop this?
Thanks
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Answers
You will need to either add the email address to the list of rejected email addresses or change the email address. It's too late in the sense that the email has been spoofed. Spammers are continually finding new ways to spoof email addresses. You may also want to see if you can change the settings for the email account to restrict send/receive from only authorized domain members. What's is this account used for and how exactly did it get spoofed? Most of the time this is due to default naming schemes for the administrator (post master) mailbox. If this is the case then that could explain how it got spoofed.
You can't really block these as the messages you see are not spam but legit messages. What spamers are doing is placing the users e-mails as the reply to address. The spamers then send out mass e-mails and when the servers that are recieving these mass e-mails bounce an error message (like unknown mailbox etc) the error goes to the reply to address.
If you block these messages then when an e-mail is legitamitally blocked the message won't make it through. It is annoying but you can't seperate the not wanted from the wanted as they are both "legit" e-mails.
The bottom line is it's easier for you to rename the email address for this user and reconfigure any authomated processes that use SMTP services to send/receive on behalf of that email address. I also recommend that if this is a high priority email alias (administrator, post master, etc..) that you filter it through your appliance and ensure that only authorized users receive mails from and send mails to that email address. This will help prevent spamming but won't eliminate it, also think of a unique naming convention for this address that spammers won't commonly used. Spammers tend to spoof default naming conventions such as admin, administrator, postmaster, mailhost, etc...
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by: USAF_The_OnePosted on 2008-03-31 at 09:49:25ID: 21247057
Is it spoofing your domain? Do you run an antispam appliance with your exchange organization?