That message is telling you that servers are not able to confirm that you are really you. That is, you might be sending email from jane@xyz.com, yet you're sending email from smtp.yahoo.com. The receiving server looks at yahoo to see if it confirms that your account is there. The SPF and DKIM settings are settings that the email provider does (not you) to confirm the relationship. I encourage you to notify your email provider of the messages and to make the correction.