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All of a sudden many of my companies emails are being blocked by Hotmail and many others due to SPF. I've added v=spf1 ip4:66.49.60.115 a mx:hpdist.com ~all to my DNS settings as a TXT record. But this hasn't helped. Is there something server side I need to adjust?

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    Do you also have reverse DNS setup as well? – DanBig Jun 3 '14 at 17:00
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    You need to know where your mail is actually coming from. Does the header information returned in the bounce messages show this? – Christopher Karel Jun 3 '14 at 17:03
  • My apologies everyone, I found we had been blacklisted due to a virus. – Seth Jun 3 '14 at 17:27
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Test to make sure your SPF record is set up correctly by sending an email to:

check-auth-USERNAME=YOURDOMAIN.com@verifier.port25.com

The address above will send email authentication results to USERNAME@YOURDOMAIN.com.

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When troubleshooting SPF records, I use http://www.kitterman.com/spf/validate.html. This lets me test DNS records before I push them to the server, that way I know they'll work before I deploy them.

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