Why your DMARC reports are not arriving, and how to check
A reporting service only gets your DMARC reports if it has authorized your domain in DNS. Without it, reports vanish silently. How to check, and how to fix it.
Read postHow to find your DKIM selector
Every DKIM key lives at a selector, and DNS will not list them. How to read it from a message header, plus verified selectors for 14 common email providers.
Read postWhen DMARC breaks legitimate mail: forwarding, mailing lists and third-party senders
Why forwarding, mailing lists and outside senders fail DMARC alignment, what aggregate reports reveal about each, and how to fix them without loosening your policy.
Read postFixing too many DNS lookups: the SPF 10-lookup limit
SPF caps you at 10 DNS lookups, 2 void lookups and 255 characters per string. Cross the line and SPF fails. How to spot it, and how to fix it without breaking mail.
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