CURLOPT_LOGIN_OPTIONS - set login options
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_LOGIN_OPTIONS, char *options);
Pass a char * as parameter, which should be pointing to the zero terminated options string to use for the transfer.
For more information about the login options please see RFC 2384, RFC 5092 and IETF draft draft-earhart-url-smtp-00.txt
CURLOPT_LOGIN_OPTIONS can be used to set protocol specific login options, such as the preferred authentication mechanism via "AUTH=NTLM" or "AUTH=*", and should be used in conjunction with the CURLOPT_USERNAME option.
The application does not have to keep the string around after setting this option.
Only IMAP, POP3 and SMTP support login options.
Added in 7.34.0
Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space.
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