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SPF, DKIM, O, U, S, E…Or, here’s what those all really mean, not just the technical junk…

4 Votes



  • Simon Baker

    I'd be interested to know if you think that if you are emailing with a sub-domain from address e.g. whether you need to set up SPF and DKIM at the root domain level, the sub-domain level or both?

  • Chris Apgar

    Hi Simon! SPF is most important on the envelope domain – in most cases you won't see a big difference from adding it to your additional from address subdomains. However, DKIM is very important on the subdomain level. DKIM is not passed down from the top level domain, so you will want to set it up on any subdomains you'll be sending from.

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