DKIM is now a very important tool to reduce the probability of your emails being flagged as spam. It's highly recommended to enable DKIM for your domains. A guide has already been written by DirectAdmin to configure DKIM, which is listed on the following page: http://help.directadmin.com/item.php?id=569
Once you have configured DKIM you can confirm if it’s setup correctly using the following DKIM Keycheck Tool: http://dkimcore.org/tools/keycheck.html
After you have configured DKIM you can continue with setting up an SPF record for your sender domain. To do this you simply add a TXT record to your domain. An illustration for a good SPF record would be:
Example.com IN TXT v=spf1 mx –all
Mailserver.example.com IN TXT v=spf1 a –all
A good explanation and summary of all the syntaxes and parameters can also be found on the following webpage: http://www.openspf.org/FAQ/Common_mistakes
Once everything is setup you can use this form based record tester to see if the SPF records are correct:
http://www.kitterman.com/spf/validate.html
For supplementary guidelines for receiving mail on Outlook and Gmail addresses please see:
https://support.google.com/mail/answer/81126?hl=en
https://mail.live.com/mail/postmaster.aspx?mkt=en
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