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: https://auth0.com/docs/email/providers#configure-a-custom-smtp-server
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.