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- Sending SMTP email to smtp. office365. com fails - Microsoft Q A
As far as I know, it is possible to use the Microsoft Entra SP as credentials for smtp office365 com, similar to how it is used in Azure Communication Services For Microsoft 365 SMTP, you can also use an Entra application with a service body for authentication
- Windows 2025 V2 | SMTP Relay - Microsoft Q A
Check the SMTP server configuration: check the SMTP server address, port, and encryption method (TLS SSL) required by your provider Common ports are 25, 465 (SSL), or 587 (TLS)
- 5. 7. 60 SMTP; Client does not have permissions to send as this sender.
I've set up a new Exchange Server 2019, but some users are encountering the error: "5 7 60 SMTP; Client does not have permissions to send as this sender " I reset the security settings to default in Active Directory for the specific user
- Basic Authentication for SMTP Deprecation - Microsoft Q A
Although SMTP AUTH is available now, we announced Exchange Online will permanently remove support for Basic authentication with Client Submission (SMTP AUTH) in September 2025 We strongly encourage customers to move away from using Basic authentication with SMTP AUTH as soon as possible
- Exchange Online - SMTP Relay for Onpremise Systems
With the imminent retirement of legacy SMTP protocols, including SMTP authentication, you will need to look for alternative ways to enable your on-premises systems to continue sending email securely
- Sending email with smtp while two factor enable - Microsoft Q A
I am sending email with smtp in my web application recently IT departement enable two factor authentication for the emails After that email sending start failing with error "Failure sending Email"
- 550 5. 7. 54 SMTP; Unable to relay recipient in non-accepted domain
Error : 550 5 7 54 SMTP; Unable to relay recipient in non-accepted The issue is happening only when i am pointing it to the SMTP address LB (which is a NSX edge load balancer) But I am able to relay the external emails from application using an individual server address using telnet over port 25
- Updated requirements for SMTP Relay in Exchange Online
This article explains how you can update your requirements for SMTP relay through Exchange Online If your organization doesn't use Inbound connector of OnPremises type, then this change doesn't affect you
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