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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_SASL_AUTHZID
+Section: 3
+Source: libcurl
+See-also:
+  - CURLOPT_PASSWORD (3)
+  - CURLOPT_USERNAME (3)
+  - CURLOPT_USERPWD (3)
+---
+
+# NAME
+
+CURLOPT_SASL_AUTHZID - authorization identity (identity to act as)
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SASL_AUTHZID, char *authzid);
+~~~
+
+# DESCRIPTION
+
+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.
+
+# DEFAULT
+
+blank
+
+# PROTOCOLS
+
+IMAP, LDAP, POP3 and SMTP
+
+# EXAMPLE
+
+~~~c
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    CURLcode res;
+    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");
+    res = curl_easy_perform(curl);
+    curl_easy_cleanup(curl);
+  }
+}
+~~~
+
+# AVAILABILITY
+
+Added in 7.66.0. Support for OpenLDAP added in 7.82.0.
+
+# RETURN VALUE
+
+Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.