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http://www.kitterman.com/spf/validate.html
16 comments
14/5/2015
sysadmin
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Prevent spammers from sending mails that abuse your domain name using an SPF record | Vanstechelman.eu
https://www.vanstechelman.eu/content/prevent-spammers-sending-mails-abuse-your-domain-name-using-spf-record
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