.SH AVAILABILITY
Added in 7.20.0
.SH RETURN VALUE
-Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
.SH "SEE ALSO"
.BR CURLOPT_MAIL_RCPT "(3), " CURLOPT_MAIL_AUTH "(3), "