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Not unique to Fastmail. Any domain that sends email should have DKIM/SPF/DMARC. SPF is quickly becoming irrelevant, but it is an easy configuration item. Recom
by johngalt 5y ago
Not unique to Fastmail. Any domain that sends email should have DKIM/SPF/DMARC. SPF is quickly becoming irrelevant, but it is an easy configuration item.
Recommend mxtoolbox for validating configurations https://mxtoolbox.com/ https://mxtoolbox.com/
Specifically send a test email to ping@tools.mxtoolbox.com and it will advise you of your current settings.
Dmarcian has good resources on DMARC specifically, and can act as an RUA report reader as a paid service. https://dmarcian.com/alignment/ https://dmarcian.com/alignment/