Spam mail issue.

130 pts.
Tags:
Domino 5
Lotus
Lotus Domino
Lotus Notes 5.x
SMTP server
Hi all, I am facing some spam mails which copy our own domain with different email address that send to our smtp server. Example: test.com is our domain. but abc@test.com is not belong to our email address. it create several email address and sending mail to our server. how to prevent this happen and stop it? Is there any setting can stop it? Current server version is domino r5.

Software/Hardware used:
Domino R5

Answer Wiki

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This is difficult to stop unless you use some spam filtering solution. The FROM address is very easy to spoof as you are seeing. This is a weakness in the SMTP protocol. A spam filtering solution should use a list of permitted directory addresses. Any non-permitted (listed) address should be dropped and not delivered. You will not be able to control these types of messages outside of your network.

Discuss This Question: 7  Replies

 
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  • R7
    Hi Labnuke99, Thanks for reply. I have a Barracuda spam filter which able to filter others spam mails. But the spam that copy our own domain is not able to filter. Barracuda will allow it to deliver to SMTP mailbox. And they will become dead mail after some times. This will bring heavy load to SMTP to process those mails. There is really no way to stop them from Domino R5 setting? or R7?
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  • Stiletto
    Do you need to be able to receive mail from the outside world that is from your own domain? If not, why not just put "*@test.com" (to use your example) in the "Deny messages from the following internet addresses/domains:" field of the server config doc?
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  • Labnuke99
    I agree with Stiletto - do you receive messages from outside of your network with your domain in the FROM address? If not, do what this poster suggests. If you need to receive messages from outside your network from your domain, then you probably should be able to add exceptions for those specific addresses (if known).
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  • R7
    Hi Stiletto/Labnuke99, Thanks for reply. Sorry to make you confuse. Outside world is sending email to my server which the user doesn't exist. But the domain is belong to me. See below: Example: kkk@test.com. Which this email address is never exist at our address book or record. But the outside world sending this email address. (but @test.com domain is belong to me). And it allow to deliver to my SMTP mailbox. End up become dead mails. How do I block/deny these emails accept by server? (There are more than 1000 similar email with different combination email address reach my server. But domain is @test.com )
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  • ITAddict
    Your Barracuda has a feature that allows you to configure a LDAP server to provide a list of valide e-mail addresses. If you have the latest version, look in the Domain Tab, click on the Domain to open the Domain page. Then click on the User Tab and then the LDAP Configuration Menu. You will see an option for Domino Directory under LDAP type.
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  • Yahoo12
    Hi, You can see the IP range from page source and block this ip range to come your SMTP Server. Open your outside email add and go to View teb ---> show ---> page source. Here you can see the all the information abt emails . from IP the mails are coming.
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  • Stiletto
    Can't help with the Barracuda, but in the Domino config doc for your server(s) there is an entry called "Verify that local domain recipients exist in the Domino Directory:" that you can set to Enabled. It's under Router/SMTP tab -> Restrictions and Controls... tab -> SMTP Inbound Controls.
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