ExchangeOnline outbound emails

Raman03 1 Reputation point


We are in the process of co-existence configuration with Exchange Online and On-Premises messaging and On-premises gateway Cisco IronPort. When we send out emails using connector from Exchange Online to On-Premises. Ironport log shows that as incoming DNS hostname as example: "". This is generic any other domain from Exchange Online outside our tenant would appear coming from similar
Is it possible that messages from our company's tenenat "Exchange Online" it appears as "" as this same address we are using to send emails from On-premise to Exchange Online? In this way on email gateway, we could see difference between emails originating from us (our company) or anyone else using Exchange Online?

Microsoft Exchange Online
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  1. Shaofan Lv-MSFT 6,915 Reputation points Microsoft Vendor

    Hello Raman03

    Do you mean configure Exchange Online to use a custom sender domain for outbound emails?



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