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Adding multiple domain in exchange

We have recently introduced service ticket for customer, and intend to use a user account name service@externaldomain.com, and whenever any service ticket will be raised then email should be generated with the name service@externaldomain.com, which ultimately forward email to a security group, & all the group members will receive alert notification. My domain is @internaldomain.com. But I need to create account service@externaldomain.com sitting in the domain@internaldomain.com, for that to receive email from service@externaldomain.com what should be done in exchange 2010 environment. As per understanding I need to perfom the followings:
1. Accepted domain needs to be created for externaldomain.com in the internaldomain.com
2. User account needs to create service@internaldomain.com
3. e-mail address policy needs to be created @externaldomain.com, and apply that policy to groups/users.

I need to know what could be other steps involved like any DNS entry and how can I apply email  address policy to groups, cause I am not intended to create seperate OU to apply email address policy, appreciate your guideline.
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2 Solutions
Patrick BogersDatacenter platform engineer LindowsCommented:

Your thoughts are correct (except for DNS, this is not necessary) , for a complete HOWTO click here.
Will SzymkowskiSenior Solution ArchitectCommented:
If you want to receive internet mail from this address you need to setup your external DNS MX record to point at your CAS/HUB server or smart host.

ipsec600Author Commented:
Hi Patricksr1972, &  Will, thank you so much for your reply.
Would you kindly assist to know how can i apply email address policy to groups/users instead of OU, cause i have seen that we have three email address policy, and those are applied to different users from different OU when i click policy properties > preview button. Apprecite any referene link to apply email address policy to groups/users or uesrs from different OU.
Patrick BogersDatacenter platform engineer LindowsCommented:
Hi again,

While setting up a e-mail policy you have the option to select membership based on 'group membership in AD' like department or company (or custom attributes). This is how my exchange server determines which user gets which standard e-mailadress.

If you mean groups like 'security groups' you need to, at least, make sure it is mail enabled.
I never tried this but can imagine it could work this way.
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