Free Temporary Email MCP server

• Registry namecom.mailtempo/mailtempoverified in the MCP registry

The registry name sits under mailtempo.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

• Stateanswerschecked 2026-10-20
• Tools3
• Server calls itselfmailtempo
• Server version0.1.0
• Protocol version2025-06-18

On 2026-10-20 the server answered initialize and tools/list without a sign-in. First answer in 228 ms.

• Whether its tools do the product's job has not been judged yet.
• Checked on 1 of the 7 days it takes to judge reliability.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

• INITE MCP scoreafter a weeka score needs 7 daily checks: 1 so far
• Answeredmeasuring1 of the 7 daily checks it takes to print a share
• Median first answer274 ms
• Space in an agent's context≈ 293 tokensthe definitions of all its tools (3), which an agent carries on every turn
• Tool definitionsC · 72 of 100

• Parameters without a description: in 2 of 3
• Not saying whether it only reads or can destroy: 3 of 3

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (30%), doing the product's job (25%), definitions (20%), context (10%) and use (15%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

• list_domains

  List all active MailTempo catchall domains. Returns { domains: [{ domain, displayName }] }. Takes no arguments.

• list_messages

  List the most recent non-hidden messages for a MailTempo address. Input: { address: string } (e.g. 'foo@yourdomain.com'). Returns up to 100 messages newest first, each with id, fromAddr, fromName, subject, snippet, receivedAt, otp.

• get_message

  Get a single MailTempo message by its public id. Input: { id: string } (8-32 chars, alphanumerics + '-' + '_'). Returns id, fromAddr, fromName, toAddr, subject, receivedAt, text, html (sanitized, remote refs stripped), otp, headers…