CURLOPT_MAIL_RCPT_ALLLOWFAILS - allow RCPT TO command to fail for some recipients

       Added in 7.69.0.

       0

       If allow is set to 1L, allow RCPT TO command to fail for some recipients.

       When sending data to multiple recipients, by default curl will abort SMTP conversation if at least one of
       the recipients causes RCPT TO command to return an error.

       The  default  behavior  can  be  changed  by  setting ignore to 1L which will make curl ignore errors and
       proceed with the remaining valid recipients.

       If all recipients trigger RCPT TO failures and this flag is specified, curl will  still  abort  the  SMTP
       conversation and return the error received from to the last RCPT TO command.

       CURL *curl = curl_easy_init();
       if(curl) {
         struct curl_slist *list;

         /* Adding one valid and one invalid email address */
         list = curl_slist_append(NULL, "person@example.com");
         list = curl_slist_append(list, "invalidemailaddress");

         curl_easy_setopt(curl, CURLOPT_URL, "smtp://example.com/");
         curl_easy_setopt(curl, CURLOPT_MAIL_RCPT_ALLLOWFAILS, 1L);

         ret = curl_easy_perform(curl);
         curl_slist_free_all(list);
         curl_easy_cleanup(curl);
       }

       CURLOPT_MAIL_RCPT_ALLLOWFAILS - allow RCPT TO command to fail for some recipients

       SMTP

       Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

CURLOPT_MAIL_FROM(3), CURLOPT_MAIL_RCPT(3),

libcurl 7.81.0                                    July 26, 2021                 CURLOPT_MAIL_RCPT_ALLLOWFAILS(3)

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_MAIL_RCPT_ALLLOWFAILS,
                                 long allow);