how to fight fake email addresss?

[Julian Field]

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That's more or less what SPF is for. SpamAssassin will do SPF checks for you.

At 07:49 16/10/2004, you wrote:
>    For example an email is sent from someone at somehost.com. To make sure it
>is not from a fake domain, check up someone.com to see whether it has the
>same ip as the ip this email is sending from. Although it is still possible
>that someother at somehonst.com faking someone at somehost.com, but at least the
>email is coming from somehost.com
>
>Jason
>
>----- Original Message -----
>From: "Ugo Bellavance" <ugob at CAMO-ROUTE.COM>
>To: <MAILSCANNER at JISCMAIL.AC.UK>
>Sent: Friday, October 15, 2004 10:53 PM
>Subject: Re: how to fight fake email addresss?
>
>
>>Jason wrote:
>>>Hi,
>>>
>>>    I'm curious to know whether MailScanner will do a DNS lookup to make
>>>sure the sender's domain matches its ip.
>>
>>What do you mean exactly?  Check that the domain exists?  That's the
>>MTA's job.  Check that the smtp server used is the good one?  That is
>>SPF and there are SPF rules in SpamAssassin.

--
Julian Field
www.MailScanner.info
Professional Support Services at www.MailScanner.biz
MailScanner thanks transtec Computers for their support
Buy the MailScanner book at www.MailScanner.info/store

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