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.

Judged purely as an API. What the request contract guarantees on retry, how complete the webhook event coverage is, whether suppressions are readable and writable programmatically, and how much the message log retains when something needs debugging in production.

Against high-frequency programmatic sends where a missed delivery is a product failure, Mail-Tester covers none of the capabilities this audience leans on (idempotency keys, webhook coverage, event stream, the suppressions API, batch sending, and SDK breadth), so it fits only where those needs are genuinely absent.

• Idempotency keys: No
• Webhooks: No
• Event stream: No
• Operating since: Not published
• Suppressions API: No
• Best published rate per 1,000: Tiers not published in comparable form
• Batch sending: No
• SDKs: None
• Deliverability: Not a sender. Scores one message at a time and helps identify obvious authentication, blacklist, and SpamAssassin issues.

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.