Quote:
Originally Posted by book*fiend
AUTH LOGIN PLAIN
SIZE 69920427
send: AUTH <censored>
reply: '535 Authentication credentials invalid\r\n'
reply: retcode (535); Msg: Authentication credentials invalid
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It is not authenticating to your gmx.com account. Go to the mail service gmx.com in your browser and verify that the login and password are still working.
I just tested mine and my gmx account is still authenticating correctly and was able to send a book.