Exchange 2019 +AD with two domain [SOLVED]

Question

I have a server with Exchange 2019
with two accepted domains : ex. domain1.com and domain2.com

when I add a new user in AD, or in Exchange admin,
the new user has automatically assigned the email with domain1.com

how do I make sure that the mailbox is on domain2 instead?
neither in edit user I can't change default mailbox.

sorry but sysadmin leaves and i never managed exchange servers.

Answer 1

See my answer above:

If you cant change the default email address, uncheck this option, save, then set the new default address

Answer 2

You can use an Email Address Policy based on some criteria or set manually when you add a new user

https://learn.microsoft.com/en-us/exchange/email-addresses-and-address-books/email-address-policies/eap-procedures?view=exchserver-2019
https://www.alitajran.com/create-email-address-policy-exchange-server/

If you cant change the default email address, uncheck this option, save, then set the new default address

Answer 3

tnx for reply,

but in "mail flow" i have found only default policy, with domain1.com,
but there are already old users with "domain2.com"
and I don't know how the old sysadmin has entered these users,
also I checked shell history but haven't found how he added these users with mailbox "domain2.com"

Answer 4

You dont need a policy. You can add manually

Answer 5

in <recipients> add (+) new mailbox and
automatically new useris added as user1@contoso1.com (can't change domain)

I don't known how to create/change user1 mailbox as contoso2.com (second accepted domain) --->users1@contoso2.com
how can manually create o modify?

if i add smtp users1@contoso2.com this remain as secondary address and can't remove users1@contoso1.com