But, especially at the SMB level, you can do this. DMARC can be a bit scary in that you have to make sure all of the email you send legitimately is authenticated with SPF or DKIM. (I could spend another six pages diving into why I think that's the case, but in the interest of helping you move on with your life, I'll spare you.) In some cases it's going to provide more robust email authentication compared to SPF. If you can't easily do this, SPF is quite likely "good enough" - but if you can implement DKIM, you should. Even at the SMB level, most mail platforms provide instructions on how to configure things so that your email sends will all be authenticated via a DKIM signature. Set it to " dash all" - you want ISPs to know that they should be free to filter mail more harshly if it fails SPF validation checks.
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