Reject or tag email signed with @mydomain.com
ugob at CAMO-ROUTE.COM
Wed Jul 13 20:57:07 IST 2005
[ The following text is in the "ISO-8859-1" character set. ]
[ Your display is set for the "US-ASCII" character set. ]
[ Some characters may be displayed incorrectly. ]
Julian Field wrote:
> Matt Kettler wrote:
>>>Julian Field wrote:
>>>>I have seen claims that the only people who have really adopted SPF so
>>>>far are the spammers themselves.
>>>So far both spammers and those who understand SPF have adopted it. I have, AOL
>>>has, even jiscmail.ac.uk has adopted it.. (dig txt jiscmail.ac.uk)
>>>Lots of nonspammers have SPF records in use.
>>>Those who don't understand SPF claim it's useless because they expect it to be
>>>an anti-spam technology and realize that spammers can easily create their own
>>>SPF records... But that whole argument is invalid as SPF isn't an anti-spam
>>>Passing SPF isn't a good indicator of nonspam. It's forgable, and we all know
>>>it. It's failing SPF that's useful, as it will eventualy force spammers and
>>>worms to stop forging their domains, making them easier to track.
> Agreed. I have users in my department who post messages claiming to be
> from their ecs.soton.ac.uk account, using SMTP servers all over the
> place, as we have had people using mail long before SMTP AUTH came
> along. Getting them to all use authenticated SMTP and our SMTP servers
> isn't really practical, especially with the emergence of networks who
> trap all outgoing SMTP connections and divert them to their own servers.
> The result is that we can't publish a useful SPF record. At least I
> don't think we can.
> Is there a way of publishing an SPF record that says nothing useful? :-)
Actually, yes... if you use a tilde (~) instead of a dash (-), it only
generates softfails... It is almost like saying nothing useful...
------------------------ MailScanner list ------------------------
To unsubscribe, email jiscmail at jiscmail.ac.uk with the words:
'leave mailscanner' in the body of the email.
Before posting, read the Wiki (http://wiki.mailscanner.info/) and
the archives (http://www.jiscmail.ac.uk/lists/mailscanner.html).
Support MailScanner development - buy the book off the website!
More information about the MailScanner