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тАО04-28-2004 06:22 AM
тАО04-28-2004 06:22 AM
Disable return of NDR messages
We are receiving a large amount of spam and when it gets rejected it tries to be returned to the sender. In most cases, the sender's address has been spoofed so I would like to just turn off all returns if possible.
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тАО04-28-2004 06:33 AM
тАО04-28-2004 06:33 AM
Re: Disable return of NDR messages
userID: /path/to/filter/script
Filter on key words in the emails, might be hard though depending on content.
OR I would try to block the incoming IP with /etc/hosts.allow & deny files.
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тАО04-28-2004 06:41 AM - last edited on тАО05-17-2021 08:58 PM by Ramya_Heera
тАО04-28-2004 06:41 AM - last edited on тАО05-17-2021 08:58 PM by Ramya_Heera
Re: Disable return of NDR messages
I want this to be generic and not have to look at indivdual IPs or messages. All I want to do is if someone sends a message to my gateway and it gets reject for whatever reason (such as unknown user), I don't want a message to be returned to the sender. I have been advised by spamcop that I should do this so that my gateway doesn't get denied. As I stated in my first message, I'm not sure if that would be compliant with the RFC.
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тАО04-28-2004 06:54 AM
тАО04-28-2004 06:54 AM
Re: Disable return of NDR messages
Or deny the domain in /etc/hosts by listing those you wish to keep...
http://ezine.daemonnews.org/200206/hosts_allow.html
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тАО05-04-2004 11:56 PM
тАО05-04-2004 11:56 PM
Re: Disable return of NDR messages
virtusertable
see
http://www.sendmail.org/virtual-hosting.html
Syntax like
a@a.com a
b@a.com b
@a.com error:nouser No such user here
results in the outright rejection of all e-mail not to a@a.com or b@a.com during the RCPT TO phase.
Look at access_db, mailertable, and virtuser_entire_domain as well.
Details are here:
http://www.sendmail.org/m4/features.html