postmark
Use when working with Postmark email platform - routes to specific sub-skills for sending emails, processing inbound email, managing templates, or configuring webhooks.
86
80%
Does it follow best practices?
Impact
98%
1.24xAverage score across 3 eval scenarios
Advisory
Suggest reviewing before use
Optimize this skill with Tessl
npx tessl skill review --optimize ./SKILL.mdSecurity
1 medium severity finding. This skill can be installed but you should review these findings before use.
W011: Third-party content exposure detected (indirect prompt injection risk)
What this means
The skill exposes the agent to untrusted, user-generated content from public third-party sources, creating a risk of indirect prompt injection. This includes browsing arbitrary URLs, reading social media posts or forum comments, and analyzing content from unknown websites.
Why it was flagged
Third-party content exposure detected (high risk: 0.90). The skill's postmark-inbound documentation (postmark-inbound/SKILL.md and handler-examples.md) explicitly requires receiving and parsing inbound webhook JSON from arbitrary external senders (TextBody, StrippedTextReply, Headers, Attachments, MailboxHash) and using that content to route, create tickets, or perform "command processing," meaning untrusted user-generated email can be read and acted on and could therefore inject instructions into the agent's workflow.
- Repository
- ActiveCampaign/postmark-skills
- Commit
73ea6bf
- Audited
- Security analysis
Is this your skill?
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