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Multiple ECP & OWA link for different mail domains in 1 exchange server 2019

GDT 5 Reputation points
2024-03-20T05:57:59.54+00:00

Hello Guys,

Recently i setup a Microsoft Exchange 2019 in Windows server 2022.

Now I configured 2 accepted domains in the exchange 2019 (which the mails are working fine inbound and outbound).

abc.com - Ex. mail user: user@abc.com

xyz.com - Ex. mail user: user@xyz.com

the issue I am facing is, when i tried to go to my browser and type mail.abc.com/owa - and i tried to log in as user@xyz.com its allowing it to log in.

Is there any possibility that I can create separate ECP & OWA external links for both different mail domains? or is there any option to block xyz.com mail to disallow them to signed in on mail.abc.com/owa and only allows them to sign in on mail.xyz.com/owa which is their own domain?

I am using only 1 exchange server.

DNS RECORDS - for 1st domain (abc.com)

mail.abc.com. 14400 - A - "Public Ip"

autoconfig.abc.com. 14400 - A - "Public Ip"

autodiscover.abc.com. 14400 - CNAME - mail.abc.com

abc.com. 14400 - MX - Priority: 0 - Destination: mail.abc.com

abc.com. 14400 - TXT - v=spf1 ip4:"Public Ip" -all

DNS RECORDS - for 2nd domain (xyz.com)

mail.xyz.com. 14400 - CNAME - mail.abc.com

autodiscover.xyz.com. 14400 - CNAME - mail.abc.com

xyz.com. 14400 - MX - Priority: 0 - Destination: mail.abc.com

xyz.com. 14400 - TXT - v=spf1 mx ip4:"Public Ip" -all

I hope you can enlighten me on this.

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  1. Kael Yao-MSFT 37,656 Reputation points Microsoft Vendor
    2024-03-20T08:15:53.9233333+00:00

    Hi @GDT,

    You can refer to this link to create additional OWA/EAC virtual directories:

    https://techcommunity.microsoft.com/t5/exchange-team-blog/configuring-multiple-owa-ecp-virtual-directories-on-the-exchange/ba-p/611217

    But to me it is also not possible to prevent users from signing into another domain.

    You may probably need to setup some rules to restrict ip addresses in IIS.

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    1 person found this answer helpful.

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