On Monday 05 February 2007 05:45, Janis Putrams wrote:
Hello!
This is my firs post to the list so I want to say thanks to all ppl that
help on fighting spam.
When reading about spf I could not fully understand the usage of ?all.
I am an email server administrator and if I allow POP access it means that
I will allways have to include "?all" for all my domains.
If user configures MS Outlook for POP access to my server he should use his
internet providers SMTP server to send out mail. So I will never be able to
use "~all". Is this correct?
SPF is about defining a list of authorized outbound mail servers for domains
to send mail from. How they receive mail is not relevant.
As an interim measure, if your uses send mail through their ISP servers and
there are too many of them to list in your SPF record, you might publish a
record ending in ?all. ?all means to treat mail from servers not listed in
the SPF record the same as no SPF at all.
To make an effective SPF record and use ~all and transitioning to -all you
need a complete list of authorized servers (as you surmize). You should
plan on using SMTP Auth and having users send through your servers or partner
with an SPF friendly provider that will do that for you.
Scott K
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