Fix SMTP message address-list issue #348.

library.json

@@ -1,6 +1,6 @@
 {
   "name": "ESP Mail Client",
-  "version": "3.4.20",
+  "version": "3.4.21",
   "keywords": "communication, email, imap, smtp, esp32, esp8266, samd, arduino",
   "description": "Arduino E-Mail Client Library to send, read and get incoming email notification for ESP32, ESP8266 and SAMD21 devices. The library also supported other Arduino Devices using Clients interfaces e.g. WiFiClient, EthernetClient, and GSMClient.",
   "repository": {

library.properties

@@ -1,6 +1,6 @@
 name=ESP Mail Client
 
-version=3.4.20
+version=3.4.21
 
 author=Mobizt
 

src/ESP_Mail_Client.h

@@ -5,7 +5,7 @@
 /**
  * Mail Client Arduino Library for Arduino devices.
  *
- * Created July 15, 2024
+ * Created July 19, 2024
  *
  * This library allows Espressif's ESP32, ESP8266, SAMD and RP2040 Pico devices to send and read Email through the SMTP and IMAP servers.
  *

src/ESP_Mail_Client_Version.h

@@ -3,8 +3,8 @@
 
 #ifndef ESP_MAIL_VERSION
 
-#define ESP_MAIL_VERSION "3.4.20"
-#define ESP_MAIL_VERSION_NUM 30420
+#define ESP_MAIL_VERSION "3.4.21"
+#define ESP_MAIL_VERSION_NUM 30421
 
 /* The inconsistent file version checking to prevent mixed versions compilation. */
 //#define VALID_VERSION_CHECK(ver) (ver == ESP_MAIL_VERSION_NUM)

src/ESP_Mail_SMTP.h

@@ -5,7 +5,7 @@
 /**
  * Mail Client Arduino Library for Espressif's ESP32 and ESP8266, Raspberry Pi RP2040 Pico, and SAMD21 with u-blox NINA-W102 WiFi/Bluetooth module
  *
- * Created August 28, 2023
+ * Created July 19, 2024
  *
  * This library allows Espressif's ESP32, ESP8266, SAMD and RP2040 Pico devices to send and read Email through the SMTP and IMAP servers.
  *
@@ -318,7 +318,8 @@ bool ESP_Mail_Client::addSendingResult(SMTPSession *smtp, SMTP_Message *msg, boo
     if (msg->timestamp.tag.length() && msg->timestamp.format.length())
         status.subject.replaceAll(msg->timestamp.tag, Time.getDateTimeString(Time.getCurrentTimestamp(), msg->timestamp.format.c_str()));
 
-    status.recipients = msg->_rcp[0].email.c_str();
+    if (msg->_rcp.size())
+        status.recipients = msg->_rcp[0].email.c_str();
     smtp->sendingResult.add(&status);
 
     smtp->_cbData._sentSuccess = smtp->_sentSuccessCount;
@@ -346,8 +347,11 @@ bool ESP_Mail_Client::addSendingResult(SMTPSession *smtp, SMTP_Message *msg, boo
             sendCallback<SMTPSession *>(smtp, buf, false, false);
             snprintf(buf, bufLen, pgm2Str(esp_mail_str_96 /* "Date/Time: %s" */), Time.getDateTimeString(ts, "%B %d, %Y %H:%M:%S").c_str());
             sendCallback<SMTPSession *>(smtp, buf, false, false);
-            snprintf(buf, bufLen, pgm2Str(esp_mail_str_97 /* "Recipient: %s" */), msg->_rcp[0].email.c_str());
-            sendCallback<SMTPSession *>(smtp, buf, false, false);
+            if (msg->_rcp.size())
+            {
+                snprintf(buf, bufLen, pgm2Str(esp_mail_str_97 /* "Recipient: %s" */), msg->_rcp[0].email.c_str());
+                sendCallback<SMTPSession *>(smtp, buf, false, false);
+            }
             snprintf(buf, bufLen, pgm2Str(esp_mail_str_92 /* "Subject: %s" */), msg->subject.c_str());
             sendCallback<SMTPSession *>(smtp, buf, false, false);
             freeMem(&buf);
@@ -372,7 +376,8 @@ void ESP_Mail_Client::saveSendingLogs(SMTPSession *smtp, SMTP_Message *msg, bool
     mbfs->print(mbfs_type smtp->_session_cfg->sentLogs.storage_type, cm.c_str());
     mbfs->print(mbfs_type smtp->_session_cfg->sentLogs.storage_type, (int)smtp->ts);
     mbfs->print(mbfs_type smtp->_session_cfg->sentLogs.storage_type, cm.c_str());
-    mbfs->print(mbfs_type smtp->_session_cfg->sentLogs.storage_type, msg->_rcp[0].email.c_str());
+    if (msg->_rcp.size())
+        mbfs->print(mbfs_type smtp->_session_cfg->sentLogs.storage_type, msg->_rcp[0].email.c_str());
     mbfs->print(mbfs_type smtp->_session_cfg->sentLogs.storage_type, cm.c_str());
     mbfs->println(mbfs_type smtp->_session_cfg->sentLogs.storage_type, msg->subject.c_str());
     mbfs->close(mbfs_type smtp->_session_cfg->sentLogs.storage_type);