Exchange - adding a second email account

I am using Exchange 2010, my company wants to add another email account.  We currently have user@123.com and they want another email called user@1234.com.   Several users will have both addresses. I am not sure how to go about creating the second account.
Donna HSr. Manager of ITAsked:
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tigermattCommented:
This is achieved by editing your Email Address Policies and adding the new domain name.
Then applying the new policy to the relevant users.

If you don't already have custom configuration, then you will likely have a default policy applying to all users and setting @123.com as their default address. You can edit this to add a new email address, meaning it will apply to all users similarly.

If you require the new domain to be applied to only a subset of users, then you will need a new policy, and to use the filtering options provided by the policy creator to filter to the appropriate set of users who should receive both addresses.

Only one email address policy can be applied to any given user, so if you create additional policies, they should also list the original @123.com if users must still retain that address.

Sending from the new address

The above will add the additional @1234.com addresses as additional (non-primary) email addresses to each affected user. All mail the users send will still originate from @123.com addresses. If users must be able to send from both @123.com and @1234.com addresses, then they must use two separate accounts and be granted Send-As / Receive-As permissions to their secondary account.
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Will SzymkowskiSenior Solution ArchitectCommented:
In this situation you need to create an Accepted Domain and an EAP (Email Address Policy).
First create your Accepted Domain
- Open the EMC
- Under Org Config, Hub Transport, Accepted Domains Tab
aa1.JPGaa2.JPGYou will then need to create the EAP and apply the accepted domain.
aa3.JPGaa4.JPGaa5.JPGaa6.JPGaa7.JPGaa8.JPG
The screenshots above is just an example. You can modify the settings as you see fit.

Will.
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tigermattCommented:
How did I forget about creating the accepted domain? This old dog has forgotten a few tricks :-)

See Will's comment -- you also need an accepted domain, otherwise Exchange is going to bounce mail sent to that new domain pretty hard!
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Will SzymkowskiSenior Solution ArchitectCommented:
Forgot to mention that when you set this up you also need to make sure that your external MX records for your 1234.com domain have are pointing to your Exchange server as well. If you do not have appropriate DNS records for 1234.com domain email will not work on the internet.

Will.
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Donna HSr. Manager of ITAuthor Commented:
Performed actions above. when I try to create an email address for user@1234.com, I selected new user, checked specify the OU rather then the dedault one, when I get to the userlogon name I thought the drop down would have @123 & @1234.com to chose from and it does not.
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tigermattCommented:
I selected new user, checked specify the OU rather then the dedault one, when I get to the userlogon name I thought the drop down would have @123 & @1234.com to chose from and it does not
You are referring to the userPrincipalName field, which is an Active Directory field totally unrelated to Exchange (although I can understand how the wizards would have you believe otherwise). The UPN is an "email-like identifier" for users across the enterprise, but it bears no resemblance to the email addresses Exchange will actually deliver mail for a user.

(The UPN is often used to give users a username equivalent to their email address, so they only have to remember one identifier. Particularly useful in larger organisations because it will work across domain trusts, so users don't have to be taught which domain their account is a member of and administrators can change this configuration at their whim.)

So, pick the only choice and create the new mailbox. The email address policies will then fire and push the relevant email addresses to that user based on however you filtered for the @1234.com addresses to be deployed.

You can add additional entries to the userPrincipalName field dropdown by adding a UPN suffix: https://technet.microsoft.com/en-gb/library/cc772007.aspx. However, as I said, UPNs are not used by Exchange for mail delivery, so doing this and picking the @1234.com UPN for a user won't cause that user to obtain an @1234.com email address by default. You would have to subsequently filter your email address policy to deploy the @1234.com address policy only to users whose UPN suffix matches 1234.com (see "Common filterable properties" here: https://technet.microsoft.com/en-GB/library/bb738157%28v=exchg.150%29.aspx)
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Will SzymkowskiSenior Solution ArchitectCommented:
when I get to the userlogon name I thought the drop down would have @123 & @1234.com to chose from and it does not.

Based on the comment above i don't think you are correctly understanding what is happening with additional EAP's.

First, when you create the EAP you can either point it at the entire OU, or also create a condition (as i have in my example) which identifies the Department Attribute. This means that any account that is in OU1 and also has "Additional Email" phrase in the Department AD Attribute will get the email address policies.

When you have multiple EAP or Secondary Email address alias applied to your Mailbox, you can Receive on multiple email addresses.

However, you CANNOT send using multiple email addresses on the same mailbox. Every Mailbox has a Primary SMTP Address and that is the address that is used for Sending mail. All other Aliases associated to a mailbox are only for receiving.

So to answer your question above you cannot simple drop down a list of email addresses for this user and send as anyone of them. Only Primary SMTP Address can send.

Will.
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tigermattCommented:
@Will: I was under the impression atcitdept was referring to the UPN field, rather than any client-side fields in Outlook or elsewhere, and wondering why the new 1234.com domain was not presenting itself when creating a new mailbox. The fact that the UPN field contains an '@' symbol is the misnomer here, I think...
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Will SzymkowskiSenior Solution ArchitectCommented:
@Tigermatt - i did read that incorrectly. However i probably read it the way i did because this question is based on creating a new Email Address Policy and not UPN Suffix.

AD Suffix is usually always different than the External SMTP Domain that Exchange Appends to your EAP when sending email.

If the user is trying to modify or change the Active Directory Suffix i think the originally asked question was miss communicated.

@atcitdept - when you create the EAP this affects that users Mailbox and not the login he/she will use. That stays the same. We are changing the SMTP domain not the suffix in active directory.

Will.
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Donna HSr. Manager of ITAuthor Commented:
Let me rephrase my question.    I need to create 2 email addresses for 1 user.   User@123.com and user@1234.com   The user is already in an OU in AD and I cannot have 2 users with the same ID in AD.
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Will SzymkowskiSenior Solution ArchitectCommented:
Ok so that is pretty straightforward then. You will need to follow most of my steps that i have outlined above.

User1 logs into the domain using domain.com\user1 or user1@domain.com (UPN).
After these changes user1 will continue to use the same login to their windows machine authenticating against active directory. This does not change.

So what you are looking for then is an Alias for User.

So you still need to create an Accepted Domain like you did in the 1st comment i mentioned.

You will then need to create a secondary Email Address (Alias) for this user.

User currently has User@123.com and you want to add User@1234.com as a secondary address?

Or

Do you want User123.com to have User1234.com as the Primary SMTP address? There is a difference. Based on the most recent comment Primary SMTP address is the SENDING address which people will see when sending from this mailbox. Alias just allow this mailbox to RECEIVE on from multiple different EMAIL ADDRESSES.

See screenshot below...
smtp1.JPGsmtp2.JPGsmtp3.JPGsmtp4.JPGsmtp5.JPG
So based on the screenshots above if you have the default email address policy applied to the user and you want the other user@1234.com email address to be primary you will to remove the "automatically update based on the email address policy" check box.

You can also follow my first post with all of the screenshots using an Email Address Policy but when you apply the policy to new mailboxes they will not get the default policy as well.

Only users that were origainally setup with the Default EAP will have both Default and 1234.com policy. In that case the EAP would be the primary.

Will.
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Donna HSr. Manager of ITAuthor Commented:
The users need to send and receive from both addresses.   Some of the users will want their default to be user@123.com and others what their default to be user@1234.com.   We are using Office Pro 2013, the users want to see both inboxes in the client and do not want to log in separately to each inbox.
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tigermattCommented:
Each user will need TWO mailboxes in that case; one for their @1234.com address and one for their @123.com address. If users log in as "UserA", you would want to create another user account "UserA1234" for their 1234.com address or vice-versa. With Outlook 2010 and higher (which therefore includes 2013) you can then add a second Exchange mailbox to their Outlook profile to have both show up as separate inboxes; OR grant UserA send-as and full access rights to UserA1234 and add as a second mailbox to the Outlook profile.

This won't work for Outlook Web Access, where the user will have to manually check both mailboxes, as will they have to add two accounts to any mobile devices which they wish to read mail on.
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