Title: Topic Brief: Email marketing and automation · Oct 19 – 26, 2026

Edition date: 2026-10-26

Coverage window: Oct 19 – 26, 2026

Lead: Braze, HubSpot push AI into email sends; no new mailbox rules found

Introduction: A quiet week for hard deliverability rules; the news is AI-driven automation from Braze, HubSpot and Klaviyo, plus Customer.io updates. Several items are from the 30-day older allowance and are dated.

Tldr

• Braze made per-recipient AI email optimization and intelligent IP warming generally available on Oct 15.
• HubSpot's Nurture Agent beta bills 10 credits per send and credit caps are now available.
• No Gmail, Yahoo or Microsoft rule change dated Oct 19–26 was confirmed.