Lumail vs Postmark
Lumail
Postmark
Transactional and application email API/SMTP (ActiveCampaign)
Lumail and Postmark pricing and feature comparison
Free emails / month
Lumail
3,000
Postmark
100
Unlimited subscribers · $0
$0
Paid entry
$20/month, 40,000 included, then $0.60/1,000
$15/month
Pricing basis
Unlimited subscribers; pricing follows email volume
Monthly email volume, not subscribers. Paid plans include 10,000 emails; extras billed per 1,000. A sent transactional or broadcast…
Automation
Graph workflows with triggers, branches, goals, exits, and A/B paths
No native journey/drip builder, list uploads, or campaign reporting. Sequences live in your application plus webhooks. Zapier Actions and…
AI and developer access
ChatGPT OAuth, MCP, skills, CLI, SDK, REST API, and visual editor
Official local MCP server with 24 tools (@activecampaign/postmark-mcp); Agent Skills (five areas); llms.txt; CLI; docs AI prompts. No…
Transactional email
Included through API, SMTP, SDK, CLI, and agent tools
Core product. REST API at https://api.postmarkapp.com (X-Postmark-Server-Token) and SMTP at smtp.postmarkapp.com on ports 25, 2525, or 587…
Publishing surface
Capture pages and custom web domains; not a general website builder
Server-side Handlebars templates plus a template editor/import tool. Broadcast Message Streams and a Bulk API (subject to approval) send…
Choose Lumail if…
- You want one organization for campaigns, graph workflows, capture pages, unlimited subscribers, and transactional API/SMTP that agents can operate (89 MCP tools plus ChatGPT OAuth plugin, CLI, SDK)
- You need a visual editor and graph workflows on every plan rather than sending newsletters from application code
- You prefer volume pricing with a 3,000-email free tier and $0.60/$0.40 per 1,000 overages over Postmark's 100-email free cap and $1.80–$1.20 per 1,000 paid overages
Choose Postmark if…
- Transactional and application email from code is the whole product, and you want Postmark's stream-separated deliverability and support
- You already store lists in your app and only need API/SMTP, templates, webhooks, and bounce/suppression tooling
- You need inbound email parsed to JSON webhooks (Pro/Platform) or dedicated IPs at 300,000+ emails/month
Where Postmark is strong
A real alternative, not a straw man.
Postmark is a developer email-delivery service for transactional and broadcast application email via REST API and SMTP, with separate message streams so those reputations never mix. People pick Postmark when they need product engineering teams that need reliable transactional and application email from code, with stream-separated broadcast, inbound parsing, and a sending….
- Deliverability-first positioning with parallel transactional vs broadcast IP infrastructure (Message Streams) and public inbox-provider stats
- REST API plus SMTP (STARTTLS on 25/2525/587), official SDKs, webhooks, templates, 45-day full content history, and inbound parse-to-JSON on Pro/Platform
- First-party AI tooling: 24-tool MCP server, Agent Skills, llms.txt, CLI, and docs prompts
Don't trust the table. Run one journey.
Checklists lie by flattening the work. Build one real path: a trigger, a wait, a branch, a goal, an exit. Then open one subscriber and see what actually happened. That tells you more than any feature row.
- 1. Import a small, consented sample. Not the whole list.
- 2. Recreate one campaign and the audience it actually hits.
- 3. Publish one automation with a goal you can measure.
- 4. Fire a test and read every event on one person.
- 5. Compare the weekly work, not the setup afternoon.
Try it on a real send
Keep the whole list. Pay when you send.
3,000 emails free, no card. Rebuild one campaign, one workflow, and one transactional message before you move anyone. If it feels worse than Postmark, stay.
The questions people actually ask
Is Lumail cheaper than Postmark?
Sometimes. Lumail is $0 for 3,000 emails, then $20 for 40,000. Postmark's number only makes sense after you know what they cap: contacts, seats, a daily send limit, or a feature they hide behind a paid plan. Read the honest take above, then price a normal month and a launch month on both pages.
What is the main difference between Lumail and Postmark?
Choose Postmark when the product you are buying is fast, high-deliverability transactional (and app-triggered broadcast) sending from code. Choose Lumail when newsletters, graph workflows, subscribers, and transactional email should live in one organization agents can operate.
Can I migrate from Postmark to Lumail?
Yes. Don't move the whole list on day one. Export a small consented sample, rebuild one campaign and one automation, authenticate your domain, then watch one subscriber go through the run. If that feels right, move the rest.