Email deliverability checklist for SaaS developers: SPF, DKIM, DMARC and provider rules

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Gmail and Yahoo began enforcing bulk sender requirements in February 2024, and Microsoft extended similar rules to Outlook.com in May 2025, with all three now moving toward outright rejection of non-compliant mail. The guidance treats roughly 5,000 daily messages to consumer mailboxes as the threshold for bulk-sender status, though it recommends that all SaaS teams follow the checklist since providers apply the same signals to everyone. It advises using a dedicated sending subdomain rather than shared provider domains, so that sending reputation stays separate from the main domain. The article explains how SPF, DKIM and DMARC work and highlights common failures, such as exceeding the 10-lookup SPF limit, having multiple SPF records, and forgotten tools that send unsigned mail. It recommends starting DMARC at p=none to monitor reports before tightening the policy to quarantine and then reject.

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