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SMTP settings for Office 365?

Hi, I’m trying to set up Auth0 to use Office 365 as a low volume Custom SMTP Provider. I don’t want to use SendGrid as it’s an additional layer (and cost) I don’t need. I’m following these instructions:

Office 365 supports these pre-reqs:

  • support LOGIN authentication.
  • support TLS 1.0 or higher.
  • use a certificate signed by a public certificate authority (CA).

I enter the details into the form for a valid mailbox (mine) but every time I try a test email, it says “Invalid login: 535 5.7.3 Authentication unsuccessful”. My account doesn’t use MFA.

I’m either doing it wrong, or these some undocumented pre-requisite that I’m not aware of. So, has anyone ever got this combination work? I Googled, but unfortunately all the references are at the mailbox level rather that trying to set up an SMTP connection.


Ignore - password had expired. D’oh! I change it and it all worked.

1 Like

Perfect! Glad you have it working!

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