Re: Contacting an Open Relay server user by spammer

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On 22 Jan 2003 16:56:51 +0100, Peter Boy wrote:

> > Efficiently, you can fight SPAM only where you have control over a
> > mail server and where you can reject messages or deny access.
> 
> We have full control here (and ask ordb and osirus for open relay
> before accepting mail as a first defense). Do you know about good
> examples how to configure sendmail or postfix without engaging
> complete programs like spamassessin (just plain sendmail / m4
> configuration options/rewriting rules)?

No, I don't know of any such method beyond blacklisting IPs and
entire domains. IMHO, SPAM/UCE can only be detected by analyzing
subject line and message body (like SpamAssassin does it).

It's just that once a server has accepted a message, the spammer is
happy, and it's too late to send out any mailer-daemon notification
because that one will never reach the spammer who uses faked or
non-existant e-mail addresses.

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