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        !            23: .TH CURLOPT_MAIL_RCPT 3 "July 16, 2019" "libcurl 7.70.0" "curl_easy_setopt options"
        !            24: 
        !            25: .SH NAME
        !            26: CURLOPT_MAIL_RCPT \- list of SMTP mail recipients
        !            27: .SH SYNOPSIS
        !            28: .nf
        !            29: #include <curl/curl.h>
        !            30: 
        !            31: CURLcode curl_easy_setopt(CURL *handle, CURLOPT_MAIL_RCPT,
        !            32:                           struct curl_slist *rcpts);
        !            33: .SH DESCRIPTION
        !            34: Pass a pointer to a linked list of recipients to pass to the server in your
        !            35: SMTP mail request. The linked list should be a fully valid list of
        !            36: \fBstruct curl_slist\fP structs properly filled in. Use
        !            37: \fIcurl_slist_append(3)\fP to create the list and \fIcurl_slist_free_all(3)\fP
        !            38: to clean up an entire list.
        !            39: 
        !            40: When performing a mail transfer, each recipient should be specified within a
        !            41: pair of angled brackets (<>), however, should you not use an angled bracket as
        !            42: the first character libcurl will assume you provided a single email address
        !            43: and enclose that address within brackets for you.
        !            44: 
        !            45: When performing an address verification (VRFY command), each recipient should
        !            46: be specified as the user name or user name and domain (as per Section 3.5 of
        !            47: RFC5321).
        !            48: 
        !            49: When performing a mailing list expand (EXPN command), each recipient should be
        !            50: specified using the mailing list name, such as "Friends" or "London-Office".
        !            51: .SH DEFAULT
        !            52: NULL
        !            53: .SH PROTOCOLS
        !            54: SMTP
        !            55: .SH EXAMPLE
        !            56: .nf
        !            57: CURL *curl = curl_easy_init();
        !            58: if(curl) {
        !            59:   struct curl_slist *list;
        !            60:   list = curl_slist_append(NULL, "root@localhost");
        !            61:   list = curl_slist_append(list, "person@example.com");
        !            62:   curl_easy_setopt(curl, CURLOPT_URL, "smtp://example.com/");
        !            63:   curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, list);
        !            64:   ret = curl_easy_perform(curl);
        !            65:   curl_slist_free_all(list);
        !            66:   curl_easy_cleanup(curl);
        !            67: }
        !            68: .fi
        !            69: .SH AVAILABILITY
        !            70: Added in 7.20.0. The VRFY and EXPN logic was added in 7.34.0
        !            71: .SH RETURN VALUE
        !            72: Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
        !            73: .SH "SEE ALSO"
        !            74: .BR CURLOPT_MAIL_FROM "(3), " CURLOPT_MAIL_AUTH "(3), "