[alerta-mailer] Fix HTML emails

integrations/mailer/mailer.py

@@ -287,12 +287,11 @@ class MailSender(threading.Thread):
 
         # by default we are going to assume that the email is going to be text
         msg_text = MIMEText(text, 'plain', 'utf-8')
+        msg.attach(msg_text)
         if html:
             msg_html = MIMEText(html, 'html', 'utf-8')
             msg.attach(msg_html)
 
-        msg.attach(msg_text)
-
         try:
             self._send_email_message(msg, contacts)
             LOG.debug('%s : Email sent to %s' % (alert.get_id(),

integrations/mailer/setup.py

@@ -2,7 +2,7 @@
 
 import setuptools
 
-version = '5.2.0'
+version = '5.2.1'
 
 setuptools.setup(
     name="alerta-mailer",