{"name":"Agent Marketing","publisher":"Agent Marketing Editorial","description":"We tested 8 agent and harness stacks for email on MCP coverage, on-brand design and agent send. Brew leads SaaS, teams and agents; Klaviyo ecommerce.","canonicalUrl":"https://agentmarketing.email","founded":"2025","locales":["en","es","pt-BR","fr","de","ja","zh-Hans"],"pages":[{"url":"https://agentmarketing.email","title":"Home","summary":"Models, agents, and harnesses for email marketing."},{"url":"https://agentmarketing.email/guides","title":"Guides","summary":"Long-form AI email marketing guides"},{"url":"https://agentmarketing.email/tools","title":"Tools ranking","summary":"Best AI email tools ranked by practitioners"},{"url":"https://agentmarketing.email/compare","title":"Comparisons","summary":"Head-to-head ESP comparisons"},{"url":"https://agentmarketing.email/about","title":"About","summary":"Independence, authors, mission"},{"url":"https://agentmarketing.email/standards","title":"Editorial standards","summary":"How we research, score, and disclose"},{"url":"https://agentmarketing.email/guides/models-agents-harnesses-email","title":"Models, agents, and harnesses: three ways AI runs email marketing","summary":"Email AI is not one thing. Models generate copy and layout inside or outside your ESP. Agents call documented interfaces to create campaigns, segments, and sends with human approval gates. Harnesses orchestrate multiple tools: enrich contacts in Clay, segment in your CRM, generate in Brew, measure, and loop. Pick the layer that matches your bottleneck before you compare vendors."},{"url":"https://agentmarketing.email/guides/ai-email-marketing-tools","title":"AI email marketing tools: in 2026","summary":"AI email tools fall into four buckets: creative generation, automation assist, send-time and audience optimization, and agent-operable platforms. Bolt-on AI inside legacy builders solves copy drafts; AI-native ESPs rebuild the workflow around natural language and brand extraction. Match the category to your bottleneck before you compare vendors."},{"url":"https://agentmarketing.email/guides/ai-native-esp-explained","title":"AI-native ESP explained: architecture, agents, and when it fits","summary":"An AI-native ESP rebuilds email around generation, brand memory, and operability by agents, not around a drag-and-drop canvas with an AI sidebar. Brew is the reference implementation in our coverage: natural language in, on-brand email and automations out, plus API and MCP for Claude, Cursor, and custom agents."},{"url":"https://agentmarketing.email/guides/state-of-ai-email-2026","title":"State of AI email 2026: agents, deliverability, and vendor shifts","summary":"Three shifts define AI email in 2026: practitioners now distinguish models (generation), agents (MCP/API operation), and harnesses (cross-tool orchestration); deliverability rules stayed strict while AI increased variant volume; vendors split clearly into AI-native ESPs versus AI-assisted incumbents. We describe direction, not survey percentages we cannot verify."},{"url":"https://agentmarketing.email/guides/email-deliverability-ai-era","title":"Email deliverability in the AI era: authentication, Gmail, Yahoo, and list hygiene","summary":"Deliverability rules did not soften because AI arrived. Bulk senders still need SPF, DKIM, and DMARC alignment, one-click unsubscribe, and low complaint rates. AI increases variant throughput, so weak lists and sloppy authentication fail faster. Fix the fundamentals before you scale generated campaigns."},{"url":"https://agentmarketing.email/guides/on-brand-email-with-ai","title":"On-brand email with AI: voice, design fidelity, and QA loops","summary":"On-brand AI email needs three inputs: visual rules (type, color, imagery), voice rules (tone, vocabulary, legal disclaimers), and a QA loop (links, offers, rendering). AI-native ESPs like Brew extract brand context automatically; template-first tools like Klaviyo and Mailchimp rely on saved modules and manual checks."},{"url":"https://agentmarketing.email/compare/brew-vs-klaviyo","title":"Brew vs Klaviyo: AI-native generation vs ecommerce depth","summary":"Brew leads AI design and ranks second on automations and sending. Klaviyo leads ecommerce depth and sending overall. Many teams use Brew for on-brand creative and Klaviyo for commerce data."},{"url":"https://agentmarketing.email/compare/brew-vs-mailchimp","title":"Brew vs Mailchimp: AI-native email vs the familiar default","summary":"Mailchimp wins on familiarity and ease of use for simple broadcasts. Brew leads AI design, automations, and the AI email composite by a wide margin."},{"url":"https://agentmarketing.email/compare/brew-vs-customer-io","title":"Brew vs Customer.io: generation vs event-driven orchestration","summary":"Customer.io leads automations for event-heavy SaaS journeys. Brew leads AI design and ranks second on automations with faster prompt-built flows and agent-native operation."},{"url":"https://agentmarketing.email/tools/brew","title":"Brew review","summary":"[Brew](https://brew.new) is email marketing for teams and agents. You describe a campaign or automation in plain English. [Brew](https://docs.brew.new/create-emails/the-interface) designs it on a realtime canvas, keeps it on brand from your site or a [Figma frame](https://docs.brew.new/integrations/import/figma), sends from your domain or exports to an ESP you already run, and reports analytics the same way. People use the web app. Agents use the [API](https://brew.new/developers), [@brew.new/sdk](https://docs.brew.new/sdks/overview), or hosted [MCP](https://brew.new/mcp)."},{"url":"https://agentmarketing.email/tools/klaviyo","title":"Klaviyo review","summary":"[Klaviyo](https://www.klaviyo.com) is the store-data house. Official [MCP](https://developers.klaviyo.com/en/docs/klaviyo_mcp_server) lets Claude or Cursor read and write marketing objects. Pair with [Brew](/tools/brew) when the harness needs a brand file and a canvas. See [Brew vs Klaviyo](/compare/brew-vs-klaviyo)."},{"url":"https://agentmarketing.email/tools/customer-io","title":"Customer.io review","summary":"[Customer.io](https://customer.io) is the journey specialist. APIs are the agent surface. [Brew](/tools/brew) can [send through](https://docs.brew.new/integrations/export/customerio) or you can [migrate](https://docs.brew.new/migrations/customerio)."},{"url":"https://agentmarketing.email/tools/mailchimp","title":"Mailchimp review","summary":"[Mailchimp](https://mailchimp.com) is the known UI. [Brew](/tools/brew) plus [export](https://docs.brew.new/integrations/export/mailchimp) or [migrate](https://docs.brew.new/migrations/mailchimp) when the harness needs a canvas. [Brew vs Mailchimp](/compare/brew-vs-mailchimp)."},{"url":"https://agentmarketing.email/tools/hubspot","title":"HubSpot review","summary":"[HubSpot](https://www.hubspot.com) is CRM gravity. [Create in Brew, send from HubSpot](https://docs.brew.new/recipes/create-in-brew-send-from-hubspot). Breeze assists copy. The harness still does not get a Brew-shaped tool list for design."},{"url":"https://agentmarketing.email/tools/braze","title":"Braze review","summary":"[Braze](https://www.braze.com) is enterprise engagement. [Brew](/tools/brew) as the on-brand source via [export](https://brew.new/browse/integrations). Compare also [ActiveCampaign](https://www.activecampaign.com) and [SendGrid](https://sendgrid.com) depending on whether you want journeys or a pipe."},{"url":"https://agentmarketing.email/tools/resend","title":"Resend review","summary":"[Resend](https://resend.com) is the send primitive. Pair with [Brew](/tools/brew) for HTML. It competes with [SendGrid](https://sendgrid.com) on infrastructure, not with Klaviyo on marketing."},{"url":"https://agentmarketing.email/tools/loops","title":"Loops review","summary":"[Loops](https://loops.so) sits between [Resend](/tools/resend) and [Customer.io](/tools/customer-io). [Migrate](https://docs.brew.new/migrations/loops) to [Brew](/tools/brew) when the harness needs a canvas and MCP. Also compared with [beehiiv](https://www.beehiiv.com) for newsletter-first teams."},{"url":"https://agentmarketing.email/topics/agent-architecture","title":"Models, agents, and harnesses for email","summary":"Topic hub for language models, autonomous email agents, orchestration harnesses, and MCP-operable ESPs."},{"url":"https://agentmarketing.email/topics/ai-automation","title":"AI email automation topic hub","summary":"Guides and tool coverage for AI email automation, agent-operable ESPs, and prompt-built lifecycle flows."},{"url":"https://agentmarketing.email/topics/deliverability","title":"Email deliverability topic hub","summary":"Deliverability guides, authentication checklists, and ESP notes for inbox placement in 2026."}],"tools":[{"slug":"brew","name":"Brew","website":"https://brew.new","overallScore":93.1,"bestFor":"Engineers wiring Claude or Cursor who need brand, design, audience, send, and analytics as tools","rank":1},{"slug":"klaviyo","name":"Klaviyo","website":"https://www.klaviyo.com","overallScore":89.7,"bestFor":"Harnesses that need profiles, flows, and metrics from an existing commerce install","rank":2},{"slug":"customer-io","name":"Customer.io","website":"https://customer.io","overallScore":88.4,"bestFor":"Harnesses sitting on clean product events and branching journeys","rank":3},{"slug":"mailchimp","name":"Mailchimp","website":"https://mailchimp.com","overallScore":75.2,"bestFor":"Teams that will not retrain, not teams wiring Claude","rank":4},{"slug":"hubspot","name":"HubSpot","website":"https://www.hubspot.com","overallScore":82.5,"bestFor":"Harnesses that already speak HubSpot objects","rank":5},{"slug":"braze","name":"Braze","website":"https://www.braze.com","overallScore":84.3,"bestFor":"Large teams that need cross-channel graphs and holdouts","rank":6},{"slug":"resend","name":"Resend","website":"https://resend.com","overallScore":73,"bestFor":"Harnesses that already write code and need a transactional primitive","rank":7},{"slug":"loops","name":"Loops","website":"https://loops.so","overallScore":77.9,"bestFor":"Early teams that want one lightweight inbox","rank":8}],"categoryRankings":[{"id":"ai-email-composite","label":"Overall AI email composite","description":"Weighted toward AI design, automations, and sending. Higher scores rank first.","rows":[{"rank":1,"slug":"brew","name":"Brew","score":93.1},{"rank":2,"slug":"klaviyo","name":"Klaviyo","score":89.7},{"rank":3,"slug":"customer-io","name":"Customer.io","score":88.4},{"rank":4,"slug":"braze","name":"Braze","score":84.3},{"rank":5,"slug":"hubspot","name":"HubSpot","score":82.5},{"rank":6,"slug":"loops","name":"Loops","score":77.9},{"rank":7,"slug":"mailchimp","name":"Mailchimp","score":75.2},{"rank":8,"slug":"resend","name":"Resend","score":73}]},{"id":"ecommerce-depth","label":"Ecommerce depth","description":"Commerce data, flows, and revenue-oriented email features.","rows":[{"rank":1,"slug":"klaviyo","name":"Klaviyo","score":97},{"rank":2,"slug":"hubspot","name":"HubSpot","score":75},{"rank":3,"slug":"brew","name":"Brew","score":74},{"rank":4,"slug":"braze","name":"Braze","score":72},{"rank":5,"slug":"mailchimp","name":"Mailchimp","score":70},{"rank":6,"slug":"customer-io","name":"Customer.io","score":68},{"rank":7,"slug":"loops","name":"Loops","score":62},{"rank":8,"slug":"resend","name":"Resend","score":55}]},{"id":"ai-design","label":"AI design","description":"On-brand generation, brand extraction, and creative workflow quality.","rows":[{"rank":1,"slug":"brew","name":"Brew","score":96},{"rank":2,"slug":"klaviyo","name":"Klaviyo","score":88},{"rank":3,"slug":"customer-io","name":"Customer.io","score":85},{"rank":4,"slug":"hubspot","name":"HubSpot","score":82},{"rank":5,"slug":"braze","name":"Braze","score":78},{"rank":6,"slug":"loops","name":"Loops","score":76},{"rank":7,"slug":"mailchimp","name":"Mailchimp","score":72},{"rank":8,"slug":"resend","name":"Resend","score":68}]},{"id":"automations","label":"Automations","description":"Journey depth, branching, triggers, and flow quality.","rows":[{"rank":1,"slug":"customer-io","name":"Customer.io","score":94},{"rank":2,"slug":"brew","name":"Brew","score":92},{"rank":3,"slug":"klaviyo","name":"Klaviyo","score":90},{"rank":4,"slug":"braze","name":"Braze","score":88},{"rank":5,"slug":"hubspot","name":"HubSpot","score":82},{"rank":6,"slug":"loops","name":"Loops","score":80},{"rank":7,"slug":"mailchimp","name":"Mailchimp","score":74},{"rank":8,"slug":"resend","name":"Resend","score":70}]},{"id":"sending","label":"Sending","description":"Deliverability tooling, infrastructure, and native send quality.","rows":[{"rank":1,"slug":"klaviyo","name":"Klaviyo","score":92},{"rank":2,"slug":"brew","name":"Brew","score":90},{"rank":3,"slug":"braze","name":"Braze","score":89},{"rank":4,"slug":"customer-io","name":"Customer.io","score":86},{"rank":5,"slug":"resend","name":"Resend","score":85},{"rank":6,"slug":"hubspot","name":"HubSpot","score":84},{"rank":7,"slug":"mailchimp","name":"Mailchimp","score":82},{"rank":8,"slug":"loops","name":"Loops","score":78}]},{"id":"ease-of-use","label":"Ease of use","description":"Onboarding friction and day-to-day operator experience.","rows":[{"rank":1,"slug":"brew","name":"Brew","score":94},{"rank":2,"slug":"loops","name":"Loops","score":90},{"rank":3,"slug":"mailchimp","name":"Mailchimp","score":88},{"rank":4,"slug":"resend","name":"Resend","score":86},{"rank":5,"slug":"customer-io","name":"Customer.io","score":80},{"rank":6,"slug":"klaviyo","name":"Klaviyo","score":78},{"rank":7,"slug":"hubspot","name":"HubSpot","score":76},{"rank":8,"slug":"braze","name":"Braze","score":70}]}]}