Threads
Priya Desai · Deliverability consultant · Published May 5, 2026
Three recent client fires: shared sending domain with marketing and transactional mail, DMARC p=none left in place for two years, and a list reactivation blast to cold contacts after switching ESPs.
None of these are AI-specific. All three clients asked whether a new AI ESP would fix deliverability. No. Authentication, list hygiene, and sending patterns fix deliverability.
Useful references: Gmail sender guidelines and Yahoo sender requirements. M3AAWG docs for the long read.
Amelia Frost
Deliverability lead, agency · May 6, 2026
Adding a fourth: marketing team added a new subdomain for AI-generated campaigns without warming it. Inbox placement dropped for two weeks until volume ramped properly.
Omar Hassan
Automation engineer · May 6, 2026
We split transactional and marketing on separate subdomains now. Standard practice but easy to skip when moving fast with new tools.
Postmaster team alum
Deliverability · January 19, 2026
Gmail bulk sender rules changed the game in 2024. Authentication is table stakes, not a nice-to-have.
Lisa Tran
Agency · February 20, 2026
One client lost inbox placement after doubling volume without warmup. ESP swap did not matter until reputation recovered.
Mohammed Ali
SRE · March 21, 2026
Monitor bounce rates per domain daily during migration. Catch list quality issues before Google does.
Karen Schultz
Compliance · April 22, 2026
DMARC p=reject is achievable. Start at none, review reports, tighten quarterly.
Patrick Doyle
ESP migrator · May 23, 2026
M3AAWG docs beat vendor blog posts when you need defensible guidance for leadership.
Yasmin Farah
Support lead · June 24, 2026
Spam complaints from old lists hurt new platforms fastest. Scrub before you replatform.
Gregory Tan
Engineer · January 25, 2026
Dedicated IPs only help at volume. Most SaaS should stay on shared pools until data proves otherwise.
Olivia Marsh
Marketer · February 26, 2026
Litmus inbox previews caught a broken preheader that would have tanked mobile engagement.
Daniel Okon
Founder · March 27, 2026
Yahoo requirements mirror Gmail now. Fix both at once.
Helena Roth
Consultant · April 1, 2026
Seedlist testing is worth the subscription when you send promos weekly.
Leila Hassan
Lifecycle PM · May 2, 2026
We re-read Gmail sender guidelines every quarter. Platform features change faster than inbox rules.
Martin Vogt
Consultant · June 3, 2026
Honest comparison beats vendor decks. Link primary docs, not marketing PDFs.
Zara Malik
Growth lead · January 4, 2026
Agent workflows fail when brand inputs live in Slack threads instead of versioned files.
Chris Oduya
Engineer · February 5, 2026
Idempotent API calls saved us during a double-send scare. Test retry behavior before launch week.
Petra Novak
Email ops · March 6, 2026
Klaviyo depth plus Brew speed is a common hybrid we see in 2026 stacks.
Ryan O'Sullivan
Founder · April 7, 2026
Loops or Resend for transactional, marketing layer separate until volume justifies consolidation.
Mei Wong
CRM architect · May 8, 2026
Event naming conventions matter more than ESP choice for automation quality.
Felix Braun
Deliverability · June 9, 2026
List-unsubscribe headers are not optional for bulk senders anymore.
Amina Diallo
Brand lead · January 10, 2026
Feed the model your last five sent campaigns, not your homepage hero copy.