I have recently become unable to send any e-mail from my Django app hosted on a DO droplet through smtp.gmail.com. Any time I try, I get the following error message:
SMTPAuthenticationError (535, ‘5.7.8 Username and Password not accepted. Learn more at\n5.7.8 http://support.google.com/mail/bin/answer.py?answer=14257 sh5sm32272477pbc.21 - gsmtp’)
Which is weird, because the username and password used works perfectly when I try to log in manually, or when sending through the exact same Django app from localhost.
I have also tried going through http://www.google.com/accounts/DisplayUnlockCaptcha , as mentioned in the Google support answer.
I have been sending at maximum a couple of hundred e-mail in total from that account, with maybe ~10 a day - so abuse seems to be out of the question for me. I should mention that the account is a paid Google Apps account.
The fact that I can use the exact same settings while using localhost as a server, plus the fact that this error has only appeared recently, makes me think that the error might have something to do with Digital Ocean.
Do you have any ideas about what might cause this?
Thanks and with the best regards, Martin
Ps. for good measure, here are my smtp settings, minus the password (which I am 100% sure is correct):
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