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Domains with -all:
8,615,207

Total domains checked:
140,123,409

Top domains with -all:
facebook.com
youtube.com
amazon.com
twitter.com
sina.com.cn
163.com
babylon.com
google.co.uk
ask.com
blogger.com
craigslist.org
livejasmin.com
adobe.com
alibaba.com
alipay.com
about.com
netflix.com
360buy.com
uol.com.br
ameblo.jp
incredibar.com
godaddy.com
clicksor.com
badoo.com
chase.com
softonic.com
outbrain.com
secureserver.net
allegro.pl
onet.pl
(site ranking from Alexa)

SPF -all

SPF aims to prevent email address forgery. A domain name owner publishes an SPF record in DNS that declares which server(s) are permitted to send email on behalf of that domain. There are several ways to end an SPF record, which determines what happens if email is received from a server that is not listed:

-all Fail The email is a forgery.
~all SoftFail The email is likely a forgery, but the domain is in transition.
?all Neutral Nothing can be said about whether the email is a forgery.
+all Pass The email is never a forgery. This option should not be used.

This site maintains a database of domains which publish SPF records that end in -all. Such domains are using SPF the way it is intended, and are safe from email forgery.

Please note that this is not an authoritative or central list of SPF-enabled domains. There is no such central list because SPF is a decentralised technology. This database was initially preloaded with domains from a number of sources (dmoz, Wikipedia, and others). If you know of a domain that publishes SPF -all but is not listed, please add it!

Submit or check a domain

You may submit a new domain name to the database. It will be checked to ensure that the SPF record ends in -all, and recorded in the database.

Domain name to check:

View the list

You may view the list of known domains that publish SPF -all records.

a - b - c - d - e - f - g - h - i - j - k - l - m - n - o - p - q - r - s - t - u - v - w - x - y - z - 0 - 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9

There is also a table of SPF -all adoption by TLD.