Assign S/MIME certificates (.cer files) to multiple Exchange Mailboxes using Set-Mailbox cmdlet and UserSMIMECertificate parameter

Question

Hi all,

I have a CSV input file which contains a number of mailbox PrimarySMTPAddress values e.g.

PrimarySMTPAddress

jsmith@test.com

mjones@test.com

sjohnson@test.com

I also have corresponding .cer (S/MIME Public certificates) stored on a file server for each mailbox i.e.

"D:\Certificates\jsmith@test.com.cer"

"D:\Certificates\mjones@test.com.cer"

"D:\Certificates\sjohnson@test.com.cer"

I have some PowerShell code which works to assign the .cer certificate to an individual mailbox using the Set-Mailbox cmdlet (see below):

$cert=New-Object System.Security.Cryptography.X509Certificates.X509Certificate2("C: emp\jsmith@test.com.cer")

$certArray = New-Object System.Collections.ArrayList

$certArray.Insert(0,$cert.GetRawCertData())

Set-Mailbox -Identity jsmith@test.com -UserSMIMECertificate $certArray

What I would like to have is a PowerShell script which will read the contents of the input.csv file (which contains the PrimarySMTPAddress values of each mailbox) and then assign (using the Set-Mailbox cmdlet and UserSMIMECertificate parameter) the .cer files to each of the related mailboxes.

Thanks in advance!

Answer

Something like this should work:

ForEach ($u in (Import-CSV C:\MyStuff\PrimarySMTPAddress.csv)){
    $p = Join-Path C:\Temp -ChildPath ("{0}.cer" -f $u.PrimarySMTPAddress)
    $cert=New-Object System.Security.Cryptography.X509Certificates.X509Certificate2($p)
    $certArray = New-Object System.Collections.ArrayList
    $certArray.Insert(0,$cert.GetRawCertData())
    Set-Mailbox -Identity $u.PrimarySMTPAddress -UserSMIMECertificate $certArray
}

Adjust the path and file names accordingly.

The code's untested as I have no access to an Exchange server or any certificates.

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Assign S/MIME certificates (.cer files) to multiple Exchange Mailboxes using Set-Mailbox cmdlet and UserSMIMECertificate parameter

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