> For the complete documentation index, see [llms.txt](https://docs.mailtrap.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.mailtrap.io/developers/email-sending/bulk/batch-send-emails.md).

# Batch send emails

Send up to 500 marketing emails in a single API call. Each email can have unique recipients and content while sharing base properties.

**Limits:**

* Maximum 500 messages per call
* Maximum 50 MB total payload size (including attachments)

**Note:** The endpoint returns HTTP 200 even if individual messages fail. Check the `responses` array for individual message status.

```json
{"openapi":"3.1.0","info":{"title":"Bulk","version":"2.0.0"},"tags":[{"name":"send-email","description":"Send marketing emails and newsletters through the bulk stream optimized for high-volume sending.\n\n{% hint style=\"info\" %}\nLearn more about [Bulk Stream](https://docs.mailtrap.io/email-api-smtp/setup/bulk-stream) and when to use it.\n{% endhint %}\n"}],"servers":[{"description":"Bulk Stream. Use a normal HTTP client `User-Agent` (as typical browsers and `curl` do); bare\nrequests without one may be blocked by edge protection.\n","url":"https://bulk.api.mailtrap.io"}],"security":[{"HeaderAuth":[]},{"BearerAuth":[]}],"components":{"securitySchemes":{"HeaderAuth":{"type":"apiKey","description":"API token in Api-Token header","in":"header","name":"Api-Token"},"BearerAuth":{"type":"http","scheme":"bearer","bearerFormat":"JWT","description":"Bearer token authentication"}},"schemas":{"BatchEmail":{"title":"Batch Email Request","description":"Send multiple emails in a single API call (up to 500)","type":"object","required":["requests"],"properties":{"base":{"description":"Base properties shared by all emails","allOf":[{"$ref":"#/components/schemas/EmailSender"},{"$ref":"#/components/schemas/EmailReplyTo"},{"$ref":"#/components/schemas/EmailSubject"},{"$ref":"#/components/schemas/EmailText"},{"$ref":"#/components/schemas/EmailHtml"},{"$ref":"#/components/schemas/EmailAttachments"},{"$ref":"#/components/schemas/EmailSendingHeaders"},{"$ref":"#/components/schemas/EmailCategory"},{"$ref":"#/components/schemas/EmailCustomVariables"},{"$ref":"#/components/schemas/TemplateUuid"},{"$ref":"#/components/schemas/TemplateVariables"}]},"requests":{"type":"array","description":"Individual email configurations (max 500)","maxItems":500,"items":{"allOf":[{"$ref":"#/components/schemas/EmailSender"},{"$ref":"#/components/schemas/EmailRecipients"},{"$ref":"#/components/schemas/EmailReplyTo"},{"$ref":"#/components/schemas/EmailSubject"},{"$ref":"#/components/schemas/EmailText"},{"$ref":"#/components/schemas/EmailHtml"},{"$ref":"#/components/schemas/EmailAttachments"},{"$ref":"#/components/schemas/EmailSendingHeaders"},{"$ref":"#/components/schemas/EmailCategory"},{"$ref":"#/components/schemas/EmailCustomVariables"},{"$ref":"#/components/schemas/TemplateUuid"},{"$ref":"#/components/schemas/TemplateVariables"}]}}}},"EmailSender":{"type":"object","properties":{"from":{"$ref":"#/components/schemas/Address"}}},"Address":{"type":"object","properties":{"email":{"type":"string","format":"email"},"name":{"type":"string"}}},"EmailReplyTo":{"type":"object","properties":{"reply_to":{"$ref":"#/components/schemas/Address"}}},"EmailSubject":{"type":"object","properties":{"subject":{"type":"string","minLength":1}}},"EmailText":{"type":"object","properties":{"text":{"type":"string","minLength":1}}},"EmailHtml":{"type":"object","properties":{"html":{"type":"string","minLength":1}}},"EmailAttachments":{"type":"object","properties":{"attachments":{"type":"array","items":{"type":"object","required":["content","filename"],"properties":{"content":{"type":"string","description":"Base64 encoded content"},"filename":{"type":"string"},"type":{"type":"string","description":"MIME type"},"disposition":{"type":"string","enum":["attachment","inline"],"default":"attachment"},"content_id":{"type":"string","description":"For inline attachments"}}}}}},"EmailSendingHeaders":{"type":"object","properties":{"headers":{"type":"object","additionalProperties":{"type":"string"}}}},"EmailCategory":{"type":"object","properties":{"category":{"type":"string","maxLength":255}}},"EmailCustomVariables":{"type":"object","properties":{"custom_variables":{"type":"object","additionalProperties":{"type":"string"}}}},"TemplateUuid":{"type":"object","properties":{"template_uuid":{"type":"string","format":"uuid","description":"Email template UUID"}}},"TemplateVariables":{"type":"object","properties":{"template_variables":{"type":"object","description":"Template variable values"}}},"EmailRecipients":{"type":"object","properties":{"to":{"type":"array","maxItems":1000,"items":{"$ref":"#/components/schemas/Address"}},"cc":{"type":"array","maxItems":1000,"items":{"$ref":"#/components/schemas/Address"}},"bcc":{"type":"array","maxItems":1000,"items":{"$ref":"#/components/schemas/Address"}}}},"BatchSentResponse":{"type":"object","properties":{"success":{"type":"boolean","description":"Overall request success"},"responses":{"type":"array","description":"Individual message results","items":{"type":"object","properties":{"success":{"type":"boolean"},"message_ids":{"type":"array","items":{"type":"string"}},"errors":{"type":"array","items":{"type":"string"}}}}},"errors":{"type":"array","description":"General errors","items":{"type":"string"}}}},"SendEmailErrorResponse":{"type":"object","description":"Error responses from the sending API use `success: false` and an `errors` array of strings\n(unlike account APIs on `mailtrap.io`, which use `error` or a single `errors` string).\n","properties":{"success":{"type":"boolean"},"errors":{"type":"array","items":{"type":"string"}}}}},"responses":{"BadRequest":{"description":"Bad request. Fix errors listed in response before retrying.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/SendEmailErrorResponse"}}}},"Unauthorized":{"description":"Unauthorized. Check your API credentials.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/SendEmailErrorResponse"}}}},"InternalError":{"description":"Internal server error. Retry later or contact support.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/SendEmailErrorResponse"}}}}}},"paths":{"/api/batch":{"post":{"summary":"Batch send emails","description":"Send up to 500 marketing emails in a single API call. Each email can have unique recipients and content while sharing base properties.\n\n**Limits:**\n- Maximum 500 messages per call\n- Maximum 50 MB total payload size (including attachments)\n\n**Note:** The endpoint returns HTTP 200 even if individual messages fail. Check the `responses` array for individual message status.\n","operationId":"batchSendEmail","tags":["send-email"],"requestBody":{"required":true,"content":{"application/json":{"schema":{"$ref":"#/components/schemas/BatchEmail"}}}},"responses":{"200":{"description":"Batch processed. Check individual responses for delivery status.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/BatchSentResponse"}}}},"400":{"$ref":"#/components/responses/BadRequest"},"401":{"$ref":"#/components/responses/Unauthorized"},"500":{"$ref":"#/components/responses/InternalError"}}}}}}
```


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