# Need PowerShell Script - Swap two domains **URL:** \ **Category:** PowerShell Help\ **Created:** [September 26, 2018, 4:50am UTC](https://forums.powershell.org/t/need-powershell-script-swap-two-domains/11379 "2018-09-26T04:50:39Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![maxmax2](https://avatars.discourse-cdn.com/v4/letter/m/e9bcb4/32.png) [@maxmax2](https://forums.powershell.org/u/maxmax2)\ **Post date:** [September 26, 2018, 4:50am UTC](https://forums.powershell.org/t/need-powershell-script-swap-two-domains/11379/1 "2018-09-26T04:50:39Z")
I have been now searching for a script that would switch primary email between two domains, using Office 365 Exchange online example each user has a primary and alias email attached to his account, user@domainA.com - is primary user@domainB.com - is alias i wish to switch and make @domainB.com the primary and the A as alias been trying to find and it seems simple, but yeah i would need help 🙂 i will add a few more points that were done before. The tenant has 3 domains: A, B, C, i only focused on users with A mad B I followed this guide - [https://gallery.technet.microsoft.com/office/Bulk-Add-SMTP-Addresses-to-e3d28842](https://gallery.technet.microsoft.com/office/Bulk-Add-SMTP-Addresses-to-e3d28842) and added the B domain to A domain users, (this did not create a SIP btw, is there another script for this as well?) Before and after the guide example: i had 2 domains with their own users, no aliases shared users@companyA.com users@companyC.com After the guide and Added a new domain with user names to [companyA.com](https://companya.com/), so it looks like this users@companyA.com + users@companyB.com users@companyC.com in the guide above i managed to create a filter, like this #Get the list of mailboxes in the Office 365 tenant $Mailboxes = @(Get-Mailbox -Filter { WindowsEmailAddress -like “\*@companyA.com” }) so when the script executed it did it all just for these users, [companyC.com](https://companyc.com/) was not affected. now what needs to be done is switching the main / primary domain for the users as explained in the first part. Let me know if i can add more details, i found a lot of scripts but the mostly add new things or do some other changes, all i need to make the switch between alias and primary, Thanks   ---
**Author:** ![sanchez](https://avatars.discourse-cdn.com/v4/letter/s/35a633/32.png) [@sanchez](https://forums.powershell.org/u/sanchez)\ **Post date:** [September 26, 2018, 5:45am UTC](https://forums.powershell.org/t/need-powershell-script-swap-two-domains/11379/2 "2018-09-26T05:45:20Z")
I believe you are just trying to change the UPN right? If so something like this should work, where upns.txt is a text file with the usernames of accounts to be changed ``` $oldsuffix = "oldupn.com" $newsuffix = "newupn.com" gc C:\scripts\upns.txt | Get-ADUser | ForEach-Object {   $newUpn = $_.UserPrincipalName.Replace($oldSuffix,$newSuffix)   $_ | Set-ADUser -UserPrincipalName $newUpn   }   ``` ---
**Author:** ![maxmax2](https://avatars.discourse-cdn.com/v4/letter/m/e9bcb4/32.png) [@maxmax2](https://forums.powershell.org/u/maxmax2)\ **Post date:** [September 26, 2018, 6:34am UTC](https://forums.powershell.org/t/need-powershell-script-swap-two-domains/11379/3 "2018-09-26T06:34:25Z")
So for me lets say it would look something like this   $oldsuffix = “[olddomain.com](http://olddomain.com)” $newsuffix = “[newdomain.com](http://newdomain.com)” gc C:\scripts\upns.txt | Get-ADUser | ForEach-Object { $newUpn = $\_.UserPrincipalName.Replace($oldSuffix,$newSuffix) $\_ | Set-ADUser -UserPrincipalName $newUpn }   and the content of the text file would be user1 user2 user3 user4 etc… Thanks ---
**Author:** ![sanchez](https://avatars.discourse-cdn.com/v4/letter/s/35a633/32.png) [@sanchez](https://forums.powershell.org/u/sanchez)\ **Post date:** [September 26, 2018, 7:16am UTC](https://forums.powershell.org/t/need-powershell-script-swap-two-domains/11379/4 "2018-09-26T07:16:30Z")
Yep, that should work 😉 Try against a few test accounts first though! ---
**Author:** ![maxmax2](https://avatars.discourse-cdn.com/v4/letter/m/e9bcb4/32.png) [@maxmax2](https://forums.powershell.org/u/maxmax2)\ **Post date:** [September 26, 2018, 7:28am UTC](https://forums.powershell.org/t/need-powershell-script-swap-two-domains/11379/5 "2018-09-26T07:28:03Z")
Since i am new to powershell, this would be a script file that is calling the text file right? also i just came across this link and i think it might fit the requirement [https://o365info.com/adding-email-addresses-using-powershell-import-from-csv-file-bulk-mode-office-365-part-5-13/](https://o365info.com/adding-email-addresses-using-powershell-import-from-csv-file-bulk-mode-office-365-part-5-13/) Thanks   ---
**Author:** ![sanchez](https://avatars.discourse-cdn.com/v4/letter/s/35a633/32.png) [@sanchez](https://forums.powershell.org/u/sanchez)\ **Post date:** [September 26, 2018, 7:58am UTC](https://forums.powershell.org/t/need-powershell-script-swap-two-domains/11379/6 "2018-09-26T07:58:05Z")
There is a lot of code on that page, you need be more specific. Which specific attribute(s) in AD are you trying to update. ---
**Author:** ![maxmax2](https://avatars.discourse-cdn.com/v4/letter/m/e9bcb4/32.png) [@maxmax2](https://forums.powershell.org/u/maxmax2)\ **Post date:** [September 26, 2018, 8:30am UTC](https://forums.powershell.org/t/need-powershell-script-swap-two-domains/11379/7 "2018-09-26T08:30:52Z")
ok here is what i will do next i will add a rename to a few users example [john.doe@dax.com](mailto:john.doe@dax.com) = \> [jdoe@dax.com](mailto:jdoe@dax.com) and then i will also make [jdoe@dax.com](mailto:jdoe@dax.com) as the primary email and i will also have to switch all the other users @dax.com to be primary email so for some i will do a rename and for some i will switch from @bax.com =\> @dax.com   ---
**Author:** ![dotnVo](https://avatars.discourse-cdn.com/v4/letter/d/4af34b/32.png) [@dotnVo](https://forums.powershell.org/u/dotnVo)\ **Post date:** [May 16, 2024, 8:34pm UTC](https://forums.powershell.org/t/need-powershell-script-swap-two-domains/11379/8 "2024-05-16T20:34:20Z")
Closed on May 16, 2024, 8:34pm UTC