diff --git a/src/libs/zbxhttp/http.c b/src/libs/zbxhttp/http.c
index 1a42631f64c..ce485c1710b 100644
--- a/src/libs/zbxhttp/http.c
+++ b/src/libs/zbxhttp/http.c
@@ -971,7 +971,7 @@ void	zbx_http_convert_to_utf8(CURL *easyhandle, char **body, size_t *size, size_
 	CURLcode	err = curl_easy_getinfo(easyhandle, CURLINFO_CONTENT_TYPE, &content_type);
 
 	if (CURLE_OK != err || NULL == content_type)
-		zabbix_log(LOG_LEVEL_DEBUG,  "cannot get content type: %s", curl_easy_strerror(err));
+		zabbix_log(LOG_LEVEL_DEBUG, "cannot get content type: %s", curl_easy_strerror(err));
 	else
 		zabbix_log(LOG_LEVEL_DEBUG, "content_type '%s'", content_type);
 #endif
diff --git a/src/libs/zbxmedia/email.c b/src/libs/zbxmedia/email.c
index 20cc7e07ec8..449ff0f8f3d 100644
--- a/src/libs/zbxmedia/email.c
+++ b/src/libs/zbxmedia/email.c
@@ -935,6 +935,26 @@ static void	zbx_mailaddr_free(zbx_mailaddr_t *mailaddr)
 	zbx_free(mailaddr);
 }
 
+static int	curl_supports_protocol(const char *protocol, char *error, size_t max_error_len)
+{
+	curl_version_info_data	*ver;
+	size_t			index = 0;
+
+	ver = curl_version_info(CURLVERSION_NOW);
+
+	while (NULL != ver->protocols[index])
+	{
+		if (0 == strcasecmp(protocol, ver->protocols[index]))
+			return SUCCEED;
+
+		index++;
+	}
+
+	zbx_snprintf(error, max_error_len, "cURL library was compiled without support for \"%s\" protocol", protocol);
+
+	return FAIL;
+}
+
 int	send_email(const char *smtp_server, unsigned short smtp_port, const char *smtp_helo, const char *smtp_email,
 		const char *mailto, const char *inreplyto, const char *mailsubject, const char *mailbody,
 		unsigned char smtp_security, unsigned char smtp_verify_peer, unsigned char smtp_verify_host,
@@ -968,6 +988,12 @@ int	send_email(const char *smtp_server, unsigned short smtp_port, const char *sm
 	}
 	else
 	{
+		if (FAIL == curl_supports_protocol("smtp", error, max_error_len))
+			goto clean;
+
+		if (FAIL == curl_supports_protocol("smtps", error, max_error_len))
+			goto clean;
+
 		ret = send_email_curl(smtp_server, smtp_port, smtp_helo, &from_mails, &to_mails, inreplyto, mailsubject,
 				mailbody, smtp_security, smtp_verify_peer, smtp_verify_host, smtp_authentication,
 				username, password, content_type, timeout, config_source_ip, config_ssl_ca_location,