# Guides & reports

Long-form guides on AI email marketing.

- [Startup GTM email compass](/guides/ai-email-marketing): Startup GTM email compass: Brew, Loops, or Klaviyo for founders who need a sendable email this week.
- [Deliverability for a startup GTM email stack](/guides/email-deliverability-2026): A 2026 email deliverability guide: Gmail/Yahoo/Microsoft bulk-sender requirements, SPF, DKIM, DMARC alignment, one-click unsubscribe (RFC 8058), spam-rate thresholds, and a practical checklist.
- [Automations on a startup GTM compass](/guides/email-automation): An email automation guide: lifecycle flows, behavioral triggers, branching, and how Customer.io, Klaviyo, ActiveCampaign, and AI-native tools like Brew compare on building journeys.
- [On-brand email for a seed GTM team](/guides/on-brand-ai-email): A guide to on-brand AI email: brand extraction, design quality, cross-client rendering, code-based templates with React Email, and governance for AI-generated email.
- [State of startup GTM email in 2026](/guides/state-of-ai-email-marketing): Cadence's 2026 report on the state of AI email marketing: the rise of AI-native ESPs, agent-operated email, deliverability mandates, and pricing-model shifts across Klaviyo, Customer.io, Loops, and more.
- [Startup GTM email tools in 2026](/guides/best-ai-email-tools-2026): Independent 2026 rankings for AI email marketing tools across sending, on-brand design, and automations. Brew, Resend, Klaviyo, and more with score-sorted tables.
- [How to choose a startup GTM email stack](/guides/startup-gtm-email-playbook): How to choose a startup GTM email stack: Loops for a lean inbox, Brew for a sendable email this week, Klaviyo if Shopify already owns revenue.

**Canonical:** https://campaigncompass.co/guides