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What's changed
Gmail, Yahoo and Microsoft now enforce authentication (SPF, DKIM and DMARC), one-click unsubscribe and spam-rate limits for bulk senders and non-compliant mail is rejected. Consent law still applies market by market, from Australia's Spam Act and the US CAN-SPAM Act to PECR and GDPR in the UK and EU. Deliverability is now a technical discipline.
Sources: Google, Yahoo and Microsoft sender guidelines, 2024 to 2026; ACMA; US FTC; UK ICO
Further reading: Scaling an ecommerce brand in 2026
What we cover
Deliverability
SPF, DKIM, DMARC, list hygiene and spam-rate monitoring
Consent and data
Consent records, preference centres and a clean CRM data model
Segmentation
By behaviour, value and lifecycle stage
Core flows
Welcome, abandonment, post-purchase, replenishment and win-back
B2B nurture
Lead scoring and handover rules agreed with sales
Incremental revenue
Holdout groups that show what email adds, not just what it touches
How we measure it
Revenue per recipient
Repeat purchase rate
Lead-to-sale conversion
Inbox placement
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