Instructions for those that might find themselves in the same boat. Added our backup mailbox as an exclusion in that policy, works now. We had the "Block Legacy Authentication" conditional access policy enabled for POP/IMAP/SMTP on all of our mailboxes which was overriding the per-mailbox SMTP Auth setting. I click test message and the error I receive says "Unable to connect to SMTP server because of invalid credentials or connection settings." I'm absolutely convinced this is something in Office 365, I just don't know what. I'm using as the server, their backup mailbox credentials to authenticate, port 587, using ssl, and it's set to send reports to one of our mailboxes.the same settings that have worked for years. I'm thinking this may have something to do with MS rolling out some changes not long ago regarding MFA/modern authentication, but I'm not finding a whole lot about this and can't confirm or find a solution for it.Ĭurrently I'm trying to configure SMTP auth in Veeam B&R for a client and I know my settings are right and the credentials for that backup mailbox are correct, but I keep getting an authentication error every time I test my settings. This broke for all of our in-house stuff as well as most if not all of our clients(that have their own office 365 tenants we manage). We have various in-house and client multi-function printers, backup solutions, etc that have SMTP authentication configured in order to do things like scan-to-email, send backup alerts, etc.
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