Forward mail from another server.

Question

Hello.

There are two infrastructures.

First: Edge + Gfi Antispam -> Exchange 2019 on-premise.
The second: Edge -> Exchange 2019 on-premise.

There is a two-way trust relationship between us.

Question: Can I take their domain mail to my Edge server for spam filtering and forward it to their mail server?

Answer 1

Sure, you wont be able to subscribe to the other AD forest, but you dont need to.
Their mx record points to your Edge, then you create a send connector based using their SMTP address space and forward to their mail server.

Answer 2

By the way is this other domain an accepted domain in your org? Just thinking about this, it occurred to me this may be a sticking point since you need to essentially relay anonymously- which means a specific receive connector for the relay and that may not work since you are receiving these messages from the internet

Answer 3

Hi @Андрей Михалевский

Relay is configured on a receive connector, while the recipient scope is specified on a send connector.

1. Yes, point their MX records to your Edge server
2. Configure a receive connector to allow Anonymous Relay. discussion here: How to configure Edge Transport server to relay external domains
3. Your send connetor to that domain should be created on Edge server.

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