[ILUG] Reminder: Please Respond to S.'s Invitation

[Paschal Nee]

Paul Mc Auley <lists at peema.org> wrote:

>If you define SPF records for a domain then any mail server which uses SPF
>as a criterion for pass/fail will reject mails that are sent through some
>other SMTP server.

As far as I can see you can you set up your SPF record to say certain
hosts are definitely valid mail servers and others could be valid.
The advantage being that if SPF is integrated with spam checking on
the receiving host then mail coming from your mail servers will have a
higher level of trust and mail coming from other servers will be
treated as if SPF was not in place.  It looks like gmail.com does this
as follows (the ?all being the important bit).

v=spf1 ip4:216.239.32.0/19 ip4:64.233.160.0/19 ip4:66.249.80.0/20
ip4:72.14.192.0/18 ip4:209.85.128.0/17 ip4:66.102.0.0/20
ip4:74.125.0.0/16 ip4:64.18.0.0/20 ip4:207.126.144.0/20 ?all

Paschal.