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Q: 

Django: 535, 'Incorrect authentication data' for SMTP

Hi,

I'm running Ubuntu 9.1 and Django 1.1.1. I am trying to connect to an outside SMTP server to send mail, and the connection has worked for several days and has sent many a message without a problem. All of the sudden, I am receiving:

"535, 'Incorrect authentication data'"

... when using the send() method on EmailMessage objects. I have specified EMAIL_HOST, EMAIL_HOST_USER, and EMAIL_HOST_PASSWORD correctly in settings.py, and the credentials are still valid. What besides invalid credentials would suddenly cause SMTP to stop working? I hadn't updated any software or made any changes to the email script. I do have Postfix installed. I can't find a log in /var/log detailing the 535 error.

Any ideas? Thanks in advance.

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