Resolving Blocked SMTP Access for certain user in Odoo Service

Hi @Omar Ataa ,

Thank you for reaching out Microsoft Q&A.

The noreply@domain.com account has been blocked due to security defaults, which is preventing the use of SMTP in your Odoo service. The reason for the block is that security defaults disable legacy authentication protocols such as IMAP, SMTP, and POP, as these protocols do not support Multi-Factor Authentication (MFA). Legacy protocols are considered less secure because they cannot enforce MFA, making them more vulnerable to attacks.

I recommend using OAuth to authenticate IMAP, POP, or SMTP connections, as it is a modern and secure authentication protocol. Legacy authentication protocols, like IMAP, POP, and SMTP, have known security vulnerabilities, as they cannot enforce Multi-Factor Authentication (MFA) and are more susceptible to attacks.

For a more secure and compliant approach, you can switch to OAuth for these protocols. OAuth supports MFA and provides a more robust and secure way to authenticate users.

you can follow the documentation: https://zcusa.951200.xyz/en-us/exchange/client-developer/legacy-protocols/how-to-authenticate-an-imap-pop-smtp-application-by-using-oauth

Hope this helps. Do let us know if you any further queries.

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Regards,
Goutam Pratti.