CURLOPT_MAIL_FROM(3) Library Functions Manual CURLOPT_MAIL_FROM(3)
NAME
CURLOPT_MAIL_FROM - SMTP sender address
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_MAIL_FROM, char *from);
DESCRIPTION
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.
In order to specify DSN parameters (as per RFC 3461), the address has
to be written in angled brackets, followed by the parameters.
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.
DEFAULT
blank
PROTOCOLS
This functionality affects smtp only
EXAMPLE
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode result;
curl_easy_setopt(curl, CURLOPT_URL, "smtp://example.com/");
curl_easy_setopt(curl, CURLOPT_MAIL_FROM, "president@example.com");
result = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}
AVAILABILITY
Added in curl 7.20.0
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).
SEE ALSO
CURLOPT_MAIL_AUTH(3), CURLOPT_MAIL_RCPT(3)
libcurl 2026-03-23 CURLOPT_MAIL_FROM(3)
curl 8.19.0 - Generated Sat Mar 28 07:01:27 CDT 2026