diff --git a/mailsend/__init__.py b/mailsend/__init__.py
index aad43c736..a63f61377 100755
--- a/mailsend/__init__.py
+++ b/mailsend/__init__.py
@@ -35,16 +35,12 @@
 
 class SMTP(SmartPlugin):
 
-    PLUGIN_VERSION = "1.4.1"
+    PLUGIN_VERSION = "1.4.2"
 
     def __init__(self, sh):
         # Call init code of parent class (SmartPlugin)
         super().__init__()
 
-        from bin.smarthome import VERSION
-        if '.'.join(VERSION.split('.', 2)[:2]) <= '1.5':
-            self.logger = logging.getLogger(__name__)
-
         self._tls = self.get_parameter_value('tls')
         self._host = self.get_parameter_value('host')
         self._port = self.get_parameter_value('port')
@@ -53,14 +49,14 @@ def __init__(self, sh):
         self._password = self.get_parameter_value('password')
 
 
-    def send(self, to, sub, msg):
-        self.__call__(to, sub, msg)
+    def send(self, to, sub, msg, caller=None, source=None):
+        self.__call__(to, sub, msg, caller, source)
 
-    def __call__(self, to, sub, msg):
+    def __call__(self, to, sub, msg, caller=None, source=None):
         try:
             smtp = self._connect()
         except Exception as e:
-            self.logger.warning("Could not connect to {0}: {1}".format(self._host, e))
+            self.logger.warning(f"Could not connect to {self._host}: {e}")
             return
         try:
             msg = MIMEText(msg, 'plain', 'utf-8')
@@ -73,7 +69,7 @@ def __call__(self, to, sub, msg):
             self.logger.debug("email prepared for sending")
             smtp.sendmail(self._from, to, msg.as_string())
         except Exception as e:
-            self.logger.warning("Could not send message {} to {}: {}".format(sub, to, e))
+            self.logger.warning(f"Could not send message {sub} to {to} (caller={caller}): {e}")
         finally:
             try:
                 smtp.quit()
diff --git a/mailsend/plugin.yaml b/mailsend/plugin.yaml
index 2c879edca..b14af5e64 100755
--- a/mailsend/plugin.yaml
+++ b/mailsend/plugin.yaml
@@ -12,7 +12,7 @@ plugin:
 #    documentation: https://github.com/smarthomeNG/smarthome/wiki/CLI-Plugin        # url of documentation (wiki) page
 #    support: https://knx-user-forum.de/forum/supportforen/smarthome-py
 
-    version: 1.4.1                 # Plugin version
+    version: 1.4.2                 # Plugin version
     sh_minversion: 1.4             # minimum shNG version to use this plugin
 #    sh_maxversion:                 # maximum shNG version to use this plugin (leave empty if latest)
     multi_instance: True           # plugin supports multi instance