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SPF: (Sender Policy Framework) This is the most common anti-spam measure used. If you are on a hosted system, there is a good chance your host has set this up for the mail server you are using. Have WordPress email you and check the message headers for evidence that the message passed the SPF check. You can get a message sent by following the Forgot Password link on the login page. To keep your old password, do not follow the link in the message.
If your system email failed the SPF check, you can set up the credentials if you have access to your DNS records and your mail server’s domain belongs to you. Check the return path of the email your system sent. If the mail server listed there has your domain name, you can set up SPF credentials. There are several how-tos on the Internet.