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04-07-2004 05:34 PM
04-07-2004 05:34 PM
How to reject spoofed mail
I am using postfix as my SMTP server which is running in Redhat 8.0.I used most of the UCE features of postfix to stop spam mail and it is doing better job.But I want to stop spoofed mail completely coming to my server.
thanks
Muralidharan
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04-07-2004 06:51 PM
04-07-2004 06:51 PM
Re: How to reject spoofed mail
Enable reverse lookup for connecting clients in postfix. Note that you will have run DNS servers with reverse zones for your own clients to connect properly to postfix.
edit /etc/postfix/main.cf
smtpd_client_restrictions = reject_unknown_client
To prevent spammers sending mail to your server with your sender address as your domain name from internet -
1) block mails from internet having sender domain as your domain.
2) To relay mails for your valid roaming users , who will have sender domain as your domain use authenticated relaying.
regards,
U.SivaKumar
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04-08-2004 02:11 AM
04-08-2004 02:11 AM
Re: How to reject spoofed mail
aol refused to accept mail from addresses that do not have valid reverse lookup records. A recent survery on my private servers show 75% of the inbound spam fails this test.
The problem is you'll need to use a sendmail hack and I have yet to figure out how to implement it.
Here is a copy of the hack and my thread which got no answers on how to implement it.
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=450771
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04-08-2004 05:03 PM
04-08-2004 05:03 PM
Re: How to reject spoofed mail
Please give clear configuration for blocking mails from internet which having sender domain as my domain address
Regards
Muralidharan
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04-08-2004 08:09 PM
04-08-2004 08:09 PM
Re: How to reject spoofed mail
Edit main.cf
smtpd_recipient_restrictions =
permit_mynetworks,
reject_unauth_destination
check_sender_access hash:/etc/postfix/sender
edit /etc/postfix/sender and put the below line
yourdomain.com DISCARD
#postmap /etc/postfix/sender
#postfix reload
regards,
U.SivaKumar