CURLOPT_SASL_AUTHZID(3)

CURLOPT_SASL_AUTHZID3

Authorization identity (identity to act as)

Usage

#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SASL_AUTHZID, char *authzid);

Overview

Pass a char pointer as parameter, which should be pointing to the null-terminated authorization identity (authzid) for the transfer. Only applicable to the PLAIN SASL authentication mechanism where it is optional.

When not specified only the authentication identity (authcid) as specified by the username is sent to the server, along with the password. The server derives a authzid from the authcid when not provided, which it then uses internally.

When the authzid is specified, the use of which is server dependent, it can be used to access another user's inbox, that the user has been granted access to, or a shared mailbox for example.

The application does not have to keep the string around after setting this option.

Using this option multiple times makes the last set string override the previous ones. Set it to NULL to disable its use again.

Default

blank

Protocols

This functionality affects imap only

Examples

int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode result;
    curl_easy_setopt(curl, CURLOPT_URL, "imap://example.com/");
    curl_easy_setopt(curl, CURLOPT_USERNAME, "Kurt");
    curl_easy_setopt(curl, CURLOPT_PASSWORD, "xipj3plmq");
    curl_easy_setopt(curl, CURLOPT_SASL_AUTHZID, "Ursel");
    result = curl_easy_perform(curl);
    curl_easy_cleanup(curl);
  }
}

Return value

curl_easy_setopt(3) returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3).

Releases

4 releases since Debian 11 (Bullseye); the text changed 3 times.

  1. 11
  2. 12
  3. 13
  4. Arch

Availability

Added in curl 7.66.0

From curl 8.23.0-1 in Arch Linux 2026-11-01. Parsed by carta from the page's man source.