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        !            23: .TH CURLOPT_MAIL_FROM 3 "May 31, 2017" "libcurl 7.70.0" "curl_easy_setopt options"
        !            24: 
        !            25: .SH NAME
        !            26: CURLOPT_MAIL_FROM \- SMTP sender address
        !            27: .SH SYNOPSIS
        !            28: #include <curl/curl.h>
        !            29: 
        !            30: CURLcode curl_easy_setopt(CURL *handle, CURLOPT_MAIL_FROM, char *from);
        !            31: .SH DESCRIPTION
        !            32: Pass a pointer to a zero terminated string as parameter. This should be used
        !            33: to specify the sender's email address when sending SMTP mail with libcurl.
        !            34: 
        !            35: An originator email address should be specified with angled brackets (<>)
        !            36: around it, which if not specified will be added automatically.
        !            37: 
        !            38: If this parameter is not specified then an empty address will be sent to the
        !            39: mail server which may cause the email to be rejected.
        !            40: 
        !            41: The application does not have to keep the string around after setting this
        !            42: option.
        !            43: .SH DEFAULT
        !            44: blank
        !            45: .SH PROTOCOLS
        !            46: SMTP
        !            47: .SH EXAMPLE
        !            48: .nf
        !            49: CURL *curl = curl_easy_init();
        !            50: if(curl) {
        !            51:   curl_easy_setopt(curl, CURLOPT_URL, "smtp://example.com/");
        !            52:   curl_easy_setopt(curl, CURLOPT_MAIL_FROM, "president@example.com");
        !            53:   ret = curl_easy_perform(curl);
        !            54:   curl_easy_cleanup(curl);
        !            55: }
        !            56: .fi
        !            57: .SH AVAILABILITY
        !            58: Added in 7.20.0
        !            59: .SH RETURN VALUE
        !            60: Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
        !            61: CURLE_OUT_OF_MEMORY if there was insufficient heap space.
        !            62: .SH "SEE ALSO"
        !            63: .BR CURLOPT_MAIL_RCPT "(3), " CURLOPT_MAIL_AUTH "(3), "