FortiMail for Dual Mail Server Routing

[Sam333]

Hello,

I am currently using Kerio Connect as my mail server, with all users stored in a local database.

I have now installed Exchange Server 2019, and it is functioning properly for sending and receiving emails.

Both servers use the same domain: @XXXX.xx.

Currently, FortiMail is configured to point to the Kerio server's IP address, and everything works as expected. However, when I change the IP address in FortiMail to point to the Exchange server, the Exchange-side mail flow operates normally.

Is it possible to configure FortiMail to recognize and forward emails to both servers based on recipient email addresses? For example:

Emails sent to user1@xxxx.xx and user2@xxxx.xx should be forwarded to the Kerio server.

Emails sent to test1@xxxx.xx and test2@xxxx.xx should be forwarded to the Exchange server.

If such a setup is possible, could you guide me on how to configure it? Specifically:

1. Can this be achieved using FortiMail policies?

2. Should I list both server IPs under the domain settings in FortiMail? If yes, how should this be configured?

I am using FortiMail 400F with firmware version 7.4.2 in Gateway Mode.

Thank you for your assistance.

[AEK]

Hi Sam

As per my knowledge you can't route mails to some server based on recipient.

I remember we could achieve such requirement at mail server level, i.e.: FML forwards all mails to server1, then server1 forwards the mails with specific recipients to server2.

Hope it helps.

[alya]

Hi Sam,

You can do it with FML with MSSP license.

useful KB: https://community.fortinet.com/t5/FortiMail/Technical-Tip-How-to-redirect-specific-email-ID-to-separ...

[AEK]

Didn't know that, thanks for updating my knowledge.

But can anyone buy a MSSP license or only MSSP partners can do?

[Sam333]

Thank you.
I believe there must be a way to do this without an MSSP license. If anyone knows about this, could they please help?

[AEK]

I had a look again but I couldn't find such feature on non-MSSP license.

[Sam333]

Thank you, everyone
We resolved the issue by configuring relay between the servers