Email Append To and Email Alert

i have an email account support@abc.come
i also add Append To ISSUE
so any one send an email to
the messages will delivered automatically to issue section ,

But the problem is:

i didn’t receive any notification when we got message on issue section ,

so i made an

Email Alart that track the issue status

and send an alert But it didnt work and get an error message

(504, ‘Invalid Username or Password’)
Traceback (most recent call last):
File “/home/frappe/frappe-bench/apps/frappe/frappe/email/”, line 306, in send_one
smtpserver.sess.sendmail(email.sender, email.recipient, encode(email.message))
File “/home/frappe/frappe-bench/apps/frappe/frappe/email/”, line 174, in sess
(self.password or “”).encode(‘utf-8’))
File “/usr/lib/python2.7/”, line 622, in login
raise SMTPAuthenticationError(code, resp)
ValidationError: (504, ‘Invalid Username or Password’)


But when i change the Append To to for example todo
and goto issue section and make a new issue manually
i successful receive notification on my email

So what i noticed is a conflict between Append To and Email Alert

is there any suggestions ?