{"id":"f31c5c43-11f3-4248-8ebf-5ea611357c66","shortId":"srYNNe","kind":"mpp","title":"Forward an email message from an AgentMail inbox to new recipients via API.","tagline":"Forward an email message from an AgentMail inbox to new recipients via API.","description":"This endpoint is part of the AgentMail MPP gateway, which provides programmatic email inboxes designed for AI agents. The Forward Message endpoint (`POST /v0/inboxes/{inbox_id}/messages/{message_id}/forward`) takes an existing message in an inbox and forwards it to one or more new recipients. The request body accepts `to`, `cc`, `bcc`, `subject`, `text`, `html`, `headers`, `reply_to`, `labels`, and `attachments` fields, following the same `SendMessageRequest` schema used by the send-message endpoint. On success it returns a `SendMessageResponse` containing the new `message_id` and `thread_id`.\n\nThe endpoint is served over the MPP (Micropayment Protocol) at `https://mpp.api.agentmail.to` and is priced at a fixed $0.01 per call according to the OpenAPI `x-payment-info` annotation. Authentication is via Bearer token in the `Authorization` header. The broader AgentMail API also supports creating inboxes ($2.00), sending messages ($0.01), replying ($0.01), managing drafts, threads, domains, webhooks, allow/block lists, and querying metrics — all accessible through the same MPP gateway.\n\nNote: the probe did not capture a live 402 MPP challenge on this specific endpoint (it returned 404 on HEAD/GET, which is expected since the operation is POST-only). The OpenAPI spec is comprehensive and the root landing page is live, so the endpoint is presumed operational when called with POST and valid path parameters.","tags":["email","inboxes","domains","drafts","threads","webhooks","messaging"],"capabilities":["email-forward","email-send","inbox-management","thread-management","attachment-support","webhook-events","custom-domains","allow-block-lists","email-metrics","bearer-auth","mpp-payment"],"categories":["email","communication"],"synonyms":["forward email","email forwarding API","agent email","AI inbox","programmatic email","email relay","message forwarding","AgentMail forward","agent inbox API"],"warnings":["Probe returned 404 on HEAD/GET because this is a POST-only endpoint; liveness not directly confirmed via 402 challenge","No dedicated documentation page found at the MPP gateway origin — docs are at docs.agentmail.to","Price ($0.01) is taken from x-payment-info in the OpenAPI spec; actual MPP challenge was not captured to cross-verify"],"endpointUrl":"https://mpp.api.agentmail.to/v0/inboxes/:inbox_id/messages/:message_id/forward","protocol":"mpp","transport":"http","auth":{"type":"mpp","details":{"realm":"mpp.api.agentmail.to","intent":"charge","method":"tempo","service_methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}}}},"qualityScore":"0.700","qualityRationale":"Full OpenAPI 3.1 spec with detailed schemas and x-payment-info pricing is available. However, the probe did not capture a live 402 MPP challenge on this POST-only endpoint (HEAD/GET returned 404 as expected), so liveness is inferred rather than confirmed. No standalone docs page was reachable on the MPP 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'/messages':53 '/v0/inboxes':50 '0.01':133,165,167 '2.00':162 '402':193 '404':202 'AI inbox' 'AgentMail forward' 'accept':76 'access':179 'accord':136 'agent':44 'agent email' 'agent inbox API' 'agentmail':7,20,33,156 'ai':43 'allow-block-lists' 'allow/block':173 'also':158 'annot':144 'api':13,26,157 'attach':88 'attachment-support' 'authent':145 'author':152 'bcc':79 'bearer':148 'bearer-auth' 'bodi':75 'broader':155 'call':135,234 'captur':190 'cc':78 'challeng':195 'comprehens':219 'contain':108 'creat':160 'custom-domains' 'design':41 'domain':171 'draft':169 'email':3,16,39 'email forwarding API' 'email relay' 'email-forward' 'email-metrics' 'email-send' 'endpoint':28,48,101,117,199,229 'exist':59 'expect':207 'field':89 'fix':132 'follow':90 'forward':1,14,46,65 'forward email' 'gateway':35,184 'head/get':204 'header':83,153 'html':82 'id':52,55,112,115 'inbox':8,21,40,51,63,161 'inbox-management' 'info':143 'label':86 'land':223 'list':174 'live':192,226 'manag':168 'messag':4,17,47,54,60,100,111,164 'message forwarding' 'metric':177 'micropay':123 'mpp':34,122,183,194 'mpp-payment' 'mpp.api.agentmail.to':126 'new':10,23,71,110 'note':185 'one':68 'openapi':139,216 'oper':210,232 'page':224 'paramet':240 'part':30 'path':239 'payment':142 'per':134 'post':49,213,236 'post-on':212 'presum':231 'price':129 'probe':187 'programmat':38 'programmatic email' 'protocol':124 'provid':37 'queri':176 'recipi':11,24,72 'repli':84,166 'request':74 'return':105,201 'root':222 'schema':94 'send':99,163 'send-messag':98 'sendmessagerequest':93 'sendmessagerespons':107 'serv':119 'sinc':208 'spec':217 'specif':198 'subject':80 'success':103 'support':159 'take':57 'text':81 'thread':114,170 'thread-management' 'token':149 'use':95 'valid':238 'via':12,25,147 'webhook':172 'webhook-events' 'x':141 'x-payment-info':140","prices":[{"id":"8e5d78b1-a220-4a17-a506-98d1a1d6e378","listingId":"f31c5c43-11f3-4248-8ebf-5ea611357c66","amountUsd":"0.01","unit":"per_call","nativeCurrency":"pathUSD","nativeAmount":"10000","chain":"tempo","payTo":null,"paymentMethod":"mpp-tempo","isPrimary":true,"details":{"realm":"mpp.api.agentmail.to","intent":"charge","method":"tempo","dynamic":false,"decimals":6,"unit_type":null,"amount_hint":null,"raw_payment":{"amount":"10000","intent":"charge","method":"tempo","currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"description":"Forward message"},"asset_contract":"0x20c000000000000000000000b9537d11c60e8b50"},"createdAt":"2026-04-18T19:47:32.030Z"}],"sources":[{"listingId":"f31c5c43-11f3-4248-8ebf-5ea611357c66","source":"mpp_dev","sourceId":"agentmail:POST:/v0/inboxes/:inbox_id/messages/:message_id/forward","sourceUrl":"https://mpp.dev/api/services","isPrimary":true,"firstSeenAt":"2026-04-18T19:47:32.030Z","lastSeenAt":"2026-04-22T04:15:05.938Z"}],"details":{"listingId":"f31c5c43-11f3-4248-8ebf-5ea611357c66","quickStartSnippet":"curl -X POST 'https://mpp.api.agentmail.to/v0/inboxes/{inbox_id}/messages/{message_id}/forward' \\\n  -H 'Authorization: Bearer YOUR_TOKEN' \\\n  -H 'Content-Type: application/json' \\\n  -d '{\"to\": \"recipient@example.com\", \"text\": \"FYI — forwarding this to you.\"}'","exampleRequest":{"cc":"manager@example.com","to":"colleague@example.com","html":"<p>Please see the forwarded message below.</p>","text":"Please see the forwarded message below.","subject":"Fwd: Original subject"},"exampleResponse":{"thread_id":"thr_xyz789","message_id":"msg_abc123"},"schema":{"path":"/v0/inboxes/:inbox_id/messages/:message_id/forward","method":"POST","payment":{"amount":"10000","intent":"charge","method":"tempo","currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"description":"Forward message"},"description":"Forward message"},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Forward Message endpoint is POST /v0/inboxes/{inbox_id}/messages/{message_id}/forward with fixed price 0.01","source_url":"https://mpp.api.agentmail.to"},{"claim":"AgentMail is the email inbox API for AI agents, raised $6M in seed funding","source_url":"https://mpp.api.agentmail.to"},{"claim":"Response schema is SendMessageResponse with message_id and thread_id","source_url":"https://mpp.api.agentmail.to"},{"claim":"Create Inbox costs $2.00, Send/Reply/Forward cost $0.01 each per x-payment-info","source_url":"https://mpp.api.agentmail.to"}],"useCases":["AI agent forwards a received email to a human supervisor for review","Automated workflow redistributes inbound messages to different team members","Agent triages support emails and forwards them to the appropriate department","Bot forwards confirmation emails to an external system's inbox","Multi-agent pipeline passes email context between specialized agents"],"bestFor":["AI agents that need their own email addresses and can forward messages programmatically","Automated email triage and routing workflows","Developers building agent-to-human email communication pipelines"],"notFor":["Bulk marketing email campaigns (this is per-message, not bulk-optimized)","Reading or managing a human user's existing Gmail/Outlook inbox"],"kindDetails":{"docs":{"homepage":"https://docs.agentmail.to"},"tags":["email","inboxes","domains","drafts","threads","webhooks","messaging"],"realm":"mpp.api.agentmail.to","status":"active","methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}},"provider":{"url":"https://agentmail.to","name":"AgentMail"},"categories":["ai","social"],"service_id":"agentmail","integration":"first-party","service_name":"AgentMail","service_description":"Email inboxes for AI agents."},"updatedAt":"2026-04-22T04:15:05.938Z"}}