CURLOPT_MAIL_FROM - Man Page

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_MAIL_FROM, char *from);

Pass a pointer to a null-terminated string as parameter. This should be used to specify the sender's email address when sending SMTP mail with libcurl.

An originator email address should be specified with angled brackets (<>) around it, which if not specified are added automatically.

If this parameter is not specified then an empty address is sent to the SMTP server which might cause the email to be rejected.

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.

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This functionality affects smtp only

int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode res;
    curl_easy_setopt(curl, CURLOPT_URL, "smtp://example.com/");
    curl_easy_setopt(curl, CURLOPT_MAIL_FROM, "president@example.com");
    res = curl_easy_perform(curl);
    curl_easy_cleanup(curl);
  }
}

Added in curl 7.20.0

Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space.

CURLOPT_MAIL_AUTH(3), CURLOPT_MAIL_RCPT(3)

curl_easy_setopt(3), CURLOPT_MAIL_AUTH(3), CURLOPT_MAIL_RCPT(3), CURLOPT_MAIL_RCPT_ALLOWFAILS(3), CURLOPT_SASL_IR(3), libcurl-symbols(3).