Remove all user accessrights from mailbox in exchange using powershell

Question

This removes all FullAccess accessrights from a mailbox for a certain user.

Remove-MailboxPermission -identity MyMailbox -user SomeUser -AccessRights FullAccess

This removes SendAs accessrights

Remove-MailboxPermission -identity MyMailbox -user SomeUser -AccessRights SendAs

Is there something I can do to remove ALL accessrights in one go, so I do not have to explicitly have to remove every single kind of accessright?

Answer 1

Here is what I ended up with:

(assumes input $alias with samaccountname/identity)

Get-MailboxPermission -Identity $alias | ForEach-Object {Remove-MailboxPermission -identity $_.Identity -user $_.User -AccessRights FullAccess -InheritanceType All -confirm: $false}
Get-MailboxPermission -Identity $alias | ForEach-Object {Remove-MailboxPermission -identity $_.Identity -user $_.User -AccessRights ReadPermission -InheritanceType All -confirm: $false}
$Permissions = Get-Mailbox -identity $alias | where {($_.Identity -like "*")} | Get-ADPermission | Where-Object { ($_.ExtendedRights -like "*send-as*") -and $_.User -notlike "*AUTHORITY*" }
if ($Permissions) 
{
    $Permissions | ForEach-Object{ Remove-ADPermission -identity $_.Identity -user $_.User -ExtendedRights "Send As" -confirm:$false }
} 

$mb = Get-mailbox -Identity $alias
$mb.GrantSendOnBehalfTo = "CN=SomeAdminAccount,CN=Users,DC=ourdomain,DC=local"

Set-Mailbox -Identity $alias -GrantSendOnBehalfTo $mb.GrantSendOnBehalfTo

Could be made a bit more elegant, but good gets the job done.

Also works using remote powershell, something that often seems to fail with creative" solutions using piping.