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Postmark: Fast, Reliable Email Delivery…

postmarkapp.com
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Overall score
69.0OK
▼ 4.5
Rank
#132
Prev: #74
saas avg
41.7
360 peers
Agent runs / week
2
Across 0 providers

Send transactional and marketing emails and get them to the inbox on time, every time. Postmark is a fast and reliable email delivery service for developers.

Audience
Developer
Markets
US
Locales
en
Opportunity cost · SaaS

Postmark: Fast, Reliable Email Delivery… could be leaving ~$2,108,000 in new ARR on the table every year

Stunt Double’s 2027 agent-traffic model projects 34% of trial, signup and plan selection sessions in the SaaS sector will be initiated or completed by AI agents[1][2]. Postmark: Fast, Reliable Email Delivery… currently scores 69.0 on the Stunt Double Index[3], with a 31-point gap to the ideal agent experience (100). The loss figure below applies that gap to the projected agent-driven slice of a typical annual recurring revenuebaseline for this sector — it is a directional estimate, not a measured conversion rate.

Gap to leader
31.0 pts
Above SaaS avg
0.0 pts
Modelled new ARR at risk
$2,108,000

Estimate assumes a $20M ARR baseline with agent-sourced expansion. Claim your domain to replace this placeholder with your reported new ARR.

Sources
  1. [1]Gartner (2025) — Intelligent Agents in AI Really Can Work Alone. Here’s How.
  2. [2]Adobe Analytics (2025) — Generative AI traffic to U.S. retail sites (weekly trend)
  3. [3]Stunt Double (2026) — Stunt Double Index methodology & scoring rubric

Category breakdown

Brand awarenessCan agents recognise you exist?
85
DiscoveryWill they pick you?
65
▼ 15.0
Information retrievalCan they read your site?
100
Market rankingWhere do you sit in the lineup?
50
AccuracyDo they tell the truth about you?
85
▼ 15.0
Task completionCan an agent complete a task on behalf of a user?
80
Delegated accessDo you let agents in, safely?
12
Contact & communicationCan an agent reach a human?
45

By agent provider

By agent provider
Session quality, 30-day rolling, N ≥ 10 per provider
Claude
Anthropic
0.0
ChatGPT Agent
OpenAI
0.0
Gemini
Google
0.0
Perplexity
Perplexity
Copilot
Microsoft
Browserbase Operator
Browserbase

Where agents get stuck

Public summary · full session replay available to verified owners
lowBrand awareness
Fewer than two social profiles linked. Agents struggle to triangulate the brand.
mediumDiscovery
No sitemap.xml. Agents can’t enumerate indexable pages.
lowMarket ranking
No review or aggregateRating schema. Agents have no signal for ranking vs peers.
mediumMarket ranking
No price visible to non-JS clients. Agents may report "pricing not disclosed".
mediumAccuracy
No freshness headers. Agents can’t tell when content was updated.
mediumTask completion
No mention of delegated auth primitives (passkey, OAuth, MCP). Agents must drive a full browser session.
highDelegated access
No MCP manifest. Agents can’t auto-discover tools or delegated capabilities.
highDelegated access
No public API docs detected. Agents have no scoped way in; they must drive a browser.
lowDelegated access
robots.txt doesn’t mention any agent user-agents. The policy for agents is implicit.
mediumContact & communication
No contact email visible in server-rendered HTML. Agents can’t fall back to email.