[Gllug] Confusion about the "Sender" field in email headers.

[David Damerell]

On Tuesday, 30 Nov 2010, Walter Stanish wrote:
>SPF records are not *required* but really do help to get mail delivered.

They also help to get it _not_ delivered in all kinds of perfectly
sensible setups where you happen not to be sending mail via your
organisation's mail servers, unless you are suggesting a straight +all
or ?all.

http://spf-all.com/stats.html is quite revealing. 90% of domains don't
use SPF. Of that 10%, 55% are publishing records other than -all. And
of those 45% of 10%, 70% are saying they don't send mail at all!

[Even the "top 1 million" (top how?) stats show that only a small
proportion of mail-sending sites actively use SPF.]

So anyone you might be sending mail to who uses "no SPF records" as
any serious indication that mail should be rejected is going to lose
very heavily.

-- 
David Damerell <damerell at chiark.greenend.org.uk> Distortion Field!
Today is Leicesterday, November.
Tomorrow will be Brieday, November.
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