dmarc
·
ESPs, subdomains, and the “Can’t get DKIM to align w/ DMARC” rabbit hole
A recurring forum storyline: you set up an ESP, authentication tools say it’s fine, yet DMARC alignment is still broken. This usually comes down to how the ESP signs DKIM (d=), whether you’re using a custom sending domain, and whether you should isolate with a sending subdomain.
DT
DMARCTrust