[Declude.JunkMail] SPF support to be added to next beta

[R. Scott Perry]

We will be adding support for SPF ("Sender Permitted From", at 
http://spf.pobox.com ) to the next beta of Declude JunkMail.  This is a 
system that lets owners of domains publish information on what mailservers 
people can use to send mail from the domain.  We expect that this can be 
very useful in blocking spam (similar to the SPAMDOMAINS test), as well as 
helping ensure that legitimate mail gets through.

http://spf.pobox.com/dns.html covers how to add an SPF record for your own 
domain.  At its simplest, if all your E-mail is coming from your 
mailserver, and your mailserver is listed in your MX record, you would add 
a TXT record of "v=spf1 +mx -all" for your domain.  The SPF records always 
start with "v=spf1"; the "+mx" means that any E-mail from an IP listed in 
your MX records is good,  and the "-all" is a default so that any other 
E-mail is bad.

The SPF system is much, much more flexible than the SPAMDOMAINS test, and 
it lets domain owners control the settings (which allows them to be much 
more accurate).  If widely implemented, it will make it much more difficult 
for spammers to get their spam delivered.

                                                   -Scott
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