--- title: "/v0/check_email" method: POST path: "/v0/check_email" deprecated: true --- # /v0/check_email `POST /v0/check_email` ## Request - Base URL: `https://api.reacher.email` - URL: `https://api.reacher.email/v0/check_email` - Auth: API key in header `Authorization` - TypeScript: (a function with typed inputs; its response is checked against the schema) > **Deprecated.** **Sunset notice: please use `/v1/check_email` instead.** Both endpoints accept the same input arguments and return the same output; only their internal implementation differs. Perform a comprehensive verification of an email address. Unlike the `/v1/check_email` endpoint, this endpoint performs an email verification immediately, without considering the Reacher server's throttling, concurrency, and other configurations. As such, this endpoint is slightly riskier than `/v1/check_email`, as the Reacher server's IP reputation can be impacted if this endpoint is called too frequently. ## Headers - `Authorization` string, required ## Request body - CheckEmailRequest: A request object to perform an email verification. The `to_email` field is required, all other fields are optional. - `from_email` string: In the SMTP connection, the FROM email address. - `to_email` string, required: The email address to check. - `hello_name` string: In the SMTP connection, the EHLO hostname. - `proxy` CheckEmailInputProxy: Proxy configuration for email verification. - `host` string, required: The proxy host address. - `port` integer, required: The proxy port number. - `username` string: Username for proxy authentication. - `password` string: Password for proxy authentication. - `smtp_port` number: SMTP port to use for email validation. Defaults to 25, but 465, 587, and 2525 are sometimes also used. - `gmail_verif_method` 'Smtp': Enumeration describing the method used to verify Gmail emails. - `hotmailb2b_verif_method` 'Smtp': Enumeration describing the method used to verify Hotmail B2B emails. - `hotmailb2c_verif_method` 'Smtp' | 'Headless': Enumeration describing the method used to verify Hotmail B2C emails. - `yahoo_verif_method` 'Api' | 'Headless' | 'Smtp': Enumeration describing the method used to verify Yahoo emails. - `check_gravatar` boolean: Whether to check if a Gravatar image exists for the given email. ## Response `200` OK - CheckEmailOutput: The result of the email verification process. - `input` string, email, required: The email address that was verified. - `is_reachable` 'invalid' | 'unknown' | 'safe' | 'risky', required: An enumeration describing the confidence level that the recipient address is valid: `safe`, `risky`, `invalid`, or `unknown`. Refer to our FAQ for detailed definitions: https://help.reacher.email/email-attributes-inside-json. - `misc` union, required: Additional information about the email account. - MiscDetails: Additional information about the email account. - `is_disposable` boolean, required: Indicates if the email address is from a known disposable email provider. - `is_role_account` boolean, required: Indicates if the email address is a role-based account. - `gravatar_url` string: URL to the Gravatar profile picture associated with the email, if available and requested. - `is_b2c` boolean, required: Is this a B2C email address? - CoreError: Details of an error encountered during the verification process. - `type` string, required: The type of error. - `message` string, required: A human-readable description of the error. - `mx` union, required: Details obtained from querying the mail server's MX records. - MxDetails: Details about the mail server's MX records. - `accepts_mail` boolean, required: Indicates if the mail server accepts emails. False if there are no MX records, the domain publishes a null MX (RFC 7505), or none of the MX hosts resolve. - `records` string[], required: List of Fully Qualified Domain Names (FQDN) of the mail server. - CoreError: Details of an error encountered during the verification process. - `type` string, required: The type of error. - `message` string, required: A human-readable description of the error. - `smtp` union, required: Results from connecting to the mail server via SMTP. - SmtpDetails: Results from SMTP connection attempts to the mail server. - `can_connect_smtp` boolean, required: Indicates if the mail exchanger can be contacted successfully. - `has_full_inbox` boolean, required: Indicates if the mailbox is full. - `is_catch_all` boolean, required: Indicates if the email address is a catch-all address. - `is_deliverable` boolean, required: Indicates if an email sent to this address is deliverable. - `is_disabled` boolean, required: Indicates if the email address has been disabled by the provider. - CoreError: Details of an error encountered during the verification process. - `type` string, required: The type of error. - `message` string, required: A human-readable description of the error. - `syntax` SyntaxDetails, required: Validation of the email address syntax. - `domain` string, required: The domain part of the email address. - `is_valid_syntax` boolean, required: Indicates if the email address syntax is valid. - `username` string, required: The username part of the email address. - `debug` DebugDetails - `start_time` string, required: The timestamp when the email verification started. - `end_time` string, required: The timestamp when the email verification ended. - `duration` Duration, required: An object representing a duration in seconds and nanoseconds. - `secs` number, required: Duration in seconds. - `nanos` number, required: Duration in nanoseconds. - `server_name` string, required: The name of the server that performed the verification. - `reacher_version` string: The version of Reacher that performed the verification, e.g. "0.11.10". - `smtp` DebugDetailsSmtp, required: SMTP details used for debugging, including the verification method. - `verif_method` VerifMethod: The method used for email verification. - `type` 'Smtp' | 'Headless' | 'Api' | 'Skipped', required: The method used for the email verification. ## Changes - **2026-10-13** `3f951831f616`: 1 info - added the optional property `debug/reacher_version` to the response with the `200` status - **2025-07-06** `cf5b66e45849`: 2 breaking - removed the enum value `Api` of the request property `gmail_verif_method` - removed the enum value `Api` of the request property `hotmailb2c_verif_method` - **2024-12-30** `0ae4aa730c0a`: 1 breaking, 2 info - removed the required property `debug/backend_name` from the response with the `200` status - added the required property `debug/server_name` to the response with the `200` status - added the required property `misc/oneOf[subschema #1: MiscDetails]/is_b2c` to the response with the `200` status - **2024-12-14** `bbc3d8433771`: 1 breaking, 1 info - removed the required property `debug/server_name` from the response with the `200` status - added the required property `debug/backend_name` to the response with the `200` status - **2024-11-25** `e205c9ae16c8`: 1 info - endpoint added [Operation history](https://skmtc.dev/reacherhq/apis/reacher/changes/v0/check_email/post.md) --- [API](https://skmtc.dev/reacherhq/apis/reacher.md) - [All operations](https://skmtc.dev/reacherhq/apis/reacher/llms.txt) - [OpenAPI document](https://skmtc.dev/reacherhq/apis/reacher/revisions/e829a8a612e2?raw)