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• 10 Ottobre 2023
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I am able to send messages from the relay to individual users hosted in the Cloud without any issues, but when trying to send to an Office 365 group I get the following error: Remote Server returned '550 5.7.1 RESOLVER.RST.AuthRequired; authentication required. However, due to significant usage, we’ve created an opt-in endpoint that legacy clients can use with TLS1.0 and TLS1.1. SMTP Authentication on Office 365 with TLS. SMTP server authentication failed. I am trying to connect to Office 365 with the proper settings, but am getting an "SMTP Error: Could not authenticate", even though the server is responding back with "235 2. Öffnen Sie das Microsoft 365 Admin Center, und gehen Sie zu Benutzer > Aktive Benutzer. Enable or disable authenticated client SMTP submission (SMTP … Preparing for TLS 1.2 in Office 365 and Office 365 GCC - Microsoft 365 Compliance | Microsoft Docs. At the end of October 2020, Microsoft blocked the use of basic authentication to connect to mailboxes in Exchange Online. Select the user, and in the flyout that appears, click Mail. Verify the Authenticated SMTP setting: unchecked = disabled, checked = enabled. Setting Up Office 365 SMTP Settings (Updated Guide) The issue should be resolved now. Since it was working previously, possibly you’ve changed some settings within your Microsoft account. You need to make sure your certificates for the connector contain your domain, or it will be treated as external email relaying. The server response was: 5.7.57 SMTP; Client was not …

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