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/*****************************************************************************
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* Project ___| | | | _ \| |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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#include <curl/curl.h>
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/* This is a simple example showing how to send mail using libcurl's SMTP
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* capabilities. It builds on the simplesmtp.c example, adding some
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* authentication and transport security.
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#define FROM "<sender@example.org>"
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#define TO "<addressee@example.net>"
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#define CC "<info@example.org>"
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static const char *payload_text[]={
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"Date: Mon, 29 Nov 2010 21:54:29 +1100\n",
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"From: " FROM "(Example User)\n",
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"Cc: " CC "(Another example User)\n",
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"Message-ID: <dcd7cb36-11db-487a-9f3a-e652a9458efd@rfcpedant.example.org>\n",
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"Subject: SMTP TLS example message\n",
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"\n", /* empty line to divide headers from body, see RFC5322 */
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"The body of the message starts here.\n",
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"It could be a lot of lines, could be MIME encoded, whatever.\n",
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struct upload_status {
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static size_t payload_source(void *ptr, size_t size, size_t nmemb, void *userp)
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struct upload_status *upload_ctx = (struct upload_status *)userp;
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if ((size == 0) || (nmemb == 0) || ((size*nmemb) < 1)) {
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data = payload_text[upload_ctx->lines_read];
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size_t len = strlen(data);
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memcpy(ptr, data, len);
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upload_ctx->lines_read ++;
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struct curl_slist *recipients = NULL;
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struct upload_status upload_ctx;
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upload_ctx.lines_read = 0;
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curl = curl_easy_init();
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/* This is the URL for your mailserver. Note the use of port 587 here,
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* instead of the normal SMTP port (25). Port 587 is commonly used for
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* secure mail submission (see RFC4403), but you should use whatever
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* matches your server configuration. */
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curl_easy_setopt(curl, CURLOPT_URL, "smtp://mainserver.example.net:587");
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/* In this example, we'll start with a plain text connection, and upgrade
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* to Transport Layer Security (TLS) using the STARTTLS command. Be careful
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* of using CURLUSESSL_TRY here, because if TLS upgrade fails, the transfer
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* will continue anyway - see the security discussion in the libcurl
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* tutorial for more details. */
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curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_ALL);
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/* If your server doesn't have a valid certificate, then you can disable
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* part of the Transport Layer Security protection by setting the
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* CURLOPT_SSL_VERIFYPEER and CURLOPT_SSL_VERIFYHOST options to 0 (false).
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* curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
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* curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
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* That is, in general, a bad idea. It is still better than sending your
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* authentication details in plain text though.
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* Instead, you should get the issuer certificate (or the host certificate
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* if the certificate is self-signed) and add it to the set of certificates
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* that are known to libcurl using CURLOPT_CAINFO and/or CURLOPT_CAPATH. See
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* docs/SSLCERTS for more information.
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curl_easy_setopt(curl, CURLOPT_CAINFO, "/path/to/certificate.pem");
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/* A common reason for requiring transport security is to protect
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* authentication details (user names and passwords) from being "snooped"
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* on the network. Here is how the user name and password are provided: */
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curl_easy_setopt(curl, CURLOPT_USERNAME, "user@example.net");
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curl_easy_setopt(curl, CURLOPT_PASSWORD, "P@ssw0rd");
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/* value for envelope reverse-path */
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curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM);
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/* Add two recipients, in this particular case they correspond to the
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* To: and Cc: addressees in the header, but they could be any kind of
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recipients = curl_slist_append(recipients, TO);
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recipients = curl_slist_append(recipients, CC);
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curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
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/* In this case, we're using a callback function to specify the data. You
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* could just use the CURLOPT_READDATA option to specify a FILE pointer to
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curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source);
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curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx);
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/* Since the traffic will be encrypted, it is very useful to turn on debug
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* information within libcurl to see what is happening during the transfer.
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curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
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/* send the message (including headers) */
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res = curl_easy_perform(curl);
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/* free the list of recipients and clean up */
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curl_slist_free_all(recipients);
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curl_easy_cleanup(curl);
added
removed
docs/examples/smtp-tls.c
