Deliverability notes
What actually breaks, and what to do about it.
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September 01, 2026 · 2 min
Don't send newsletters from your transactional domain
Complaints about a newsletter follow the domain that sent it. Share one domain and a campaign can cost you password resets.
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August 28, 2026 · 2 min
Two DMARC records is worse than none
A domain with two DMARC records has no DMARC policy at all. It looks configured, reports nothing, and enforces nothing.
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August 14, 2026 · 3 min
SPF, DKIM and DMARC, explained by what actually breaks
Three records, three different jobs. Here is what each one does, and the specific ways each one silently fails.