Mail-Tester

Mail-Tester gives senders a generated address, analyzes the received message, and returns a spam score with authentication and content diagnostics. It is not a full monitoring suite, but it is one of the simplest ways to catch obvious DNS, SpamAssassin, and content issues before a campaign sends.

An agent stack treats email as a two-way primitive. Inbound has to arrive as structured JSON a tool call can consume, sends have to be safe to retry when a model loop repeats itself, and every action needs an audit trail. A provider without inbound parsing only solves half the problem.

Against inbound parsing into tool calls and model-generated sends that must not duplicate, Mail-Tester covers none of the capabilities this audience leans on (inbound parsing, idempotency keys, webhook coverage, event stream, batch sending, SDK breadth, and multi-tenant support), so it fits only where those needs are genuinely absent.

• Inbound parsing: No
• Idempotency keys: No
• Webhooks: No
• Operating since: Not published
• Event stream: No
• Best published rate per 1,000: Tiers not published in comparable form
• Batch sending: No
• SDKs: None
• Multi-tenant: No

Not a sender. Scores one message at a time and helps identify obvious authentication, blacklist, and SpamAssassin issues.

Developers and marketers who need a quick preflight check for a specific message.

Teams that need continuous DMARC monitoring or inbox placement reporting.