Mxtoolbox is able to identify SPF records for two of our subdomains however google is stating the SPF success rate is 0% for these two subdomains. Is there something we need to do on marketo's end for google to find the SPF record for these two subdomains?
Domains used only the in the From: header will never pass or fail SPF, because the SPF record for From: addresses is never looked up.
SPF is only looked up for the MAIL FROM: domain, a.k.a. envelope sender.
(Of course, you haven’t said exactly where you’re using this subdomain.)
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