Merge 59b8c7a6b8 into 91faed0c6d

apprise/plugins/email/base.py

@@ -935,7 +935,7 @@ class NotifyEmail(NotifyBase):
                 base = MIMEText(body, 'plain', 'utf-8')
 
             if attach:
-                mixed = MIMEMultipart("mixed")
+                mixed = MIMEMultipart("related")
                 mixed.attach(base)
                 # Now store our attachments
                 for no, attachment in enumerate(attach, start=1):
@@ -967,6 +967,10 @@ class NotifyEmail(NotifyBase):
                                 Header(filename, 'utf-8')),
                         )
                         mixed.attach(app)
+                        app.add_header(
+                            'Content-ID',
+                             '<{}>'.format(Header(filename, 'utf-8')),
+                        )
                 base = mixed
 
             if pgp: