diff options
Diffstat (limited to 'docs/examples/smtp-tls.c')
| -rw-r--r-- | docs/examples/smtp-tls.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/docs/examples/smtp-tls.c b/docs/examples/smtp-tls.c index 4e610d9ac..4872dbdf1 100644 --- a/docs/examples/smtp-tls.c +++ b/docs/examples/smtp-tls.c @@ -117,7 +117,12 @@ int main(void) * docs/SSLCERTS for more information. */ curl_easy_setopt(curl, CURLOPT_CAINFO, "/path/to/certificate.pem"); - /* Value for envelope reverse-path */ + /* Note that this option isn't strictly required, omitting it will result in + * libcurl sending the MAIL FROM command with empty sender data. All + * autoresponses should have an empty reverse-path, and should be directed + * to the address in the reverse-path which triggered them. Otherwise, they + * could cause an endless loop. See RFC 5321 Section 4.5.5 for more details. + */ curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM); /* Add two recipients, in this particular case they correspond to the @@ -127,9 +132,9 @@ int main(void) recipients = curl_slist_append(recipients, CC); curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients); - /* In this case, we're using a callback function to specify the data. You - * could just use the CURLOPT_READDATA option to specify a FILE pointer to - * read from. */ + /* We're using a callback function to specify the payload (the headers and + * body of the message). You could just use the CURLOPT_READDATA option to + * specify a FILE pointer to read from. */ curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source); curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx); curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L); |