CURLOPT_MAIL_RCPT_ALLOWFAILS(3) Introduction to Library Functions

NAME

CURLOPT_MAIL_RCPT_ALLOWFAILS - allow RCPT TO command to fail for some
recipients

SYNOPSIS

#include <curl/curl.h>

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

DESCRIPTION

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

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

The default behavior can be changed by setting allow to 1L which
makes libcurl ignore errors for individual recipients and proceed
with the remaining accepted recipients.

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

DEFAULT

0

PROTOCOLS

This functionality affects smtp only

EXAMPLE

int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
struct curl_slist *list;
CURLcode result;

/* 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_ALLOWFAILS, 1L);

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

HISTORY

This option was called CURLOPT_MAIL_RCPT_ALLLOWFAILS (with three
instead of two letter L) before 8.2.0

AVAILABILITY

Added in curl 8.2.0

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_FROM(3), CURLOPT_MAIL_RCPT(3)

libcurl 2026-01-08 CURLOPT_MAIL_RCPT_ALLOWFAILS(3)