Forum Discussion
SMTP relay
Hi all we are a large software development house with hundreds of Virtaul environments we recently migrated our exchange environments from internal to 365. we use an internal Linux SMTP server ru...
What you describe is a requirement for SMTP Auth as the method for sending email. You might want to try one of the other 2 methods for relaying with Exchange Online: https://learn.microsoft.com/en-us/exchange/mail-flow-best-practices/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-microsoft-365-or-office-365