I have setup Exchange hybrid mode with option centralized mail transport, so all internet inbound and outbound mail is routed via the on-premises 3rd party Antispam/SMTP appliances.
In order to ensure no mail from the Internet can bypass the on-premises 3rd party Antispam/SMTP appliances, I would like to configure a restriction, so that no e-mail from internet can be delivered via the EOP/Exchange online infrastructure.
I am thinking of the following approach: Create a new inbound connector with the following configuration:
From: Partner Organization
To: Office365
Identify Partner Organisation: Use the sender's IP address
SenderIPAddresses : {Exchange On-premises external IPs, other company IPs required}
SenderDomains : {smtp:wildcard;1}
RestrictDomainsToIPAddresses : True
Now the question i have is: Is this the correct approach or does this new inbound connector with "ConnectorType : Partner" interfere with the inbound connector created by the hybrid configuration ("ConnectorType : OnPremises") and used to receive mails from on-premises Exchange?
Thanks for your feedback in advance. Cheers
HaileSelassie