Remove Multiple SMTP address

Hi Guy's,

I've found a script and modified it so i can specify which smtp addresses to remove. The trouble im having is this script removes all the smtp addresses rather than one ones i specify in my input file. Can about help as I'm not getting any error messages when i run the script so its hard to troubleshoot.

# User provided list of mailboxes
$mailbox = Get-Content -Path C:\usermailboxes.csv

#Domains to remove from user account
$domains = Get-Content -Path C:\domains.txt

foreach($domain in $domains)
{
Write-Host "Processing domain" $domain -BackgroundColor Yellow
    foreach($item in $mailbox)  
    {
    $item = Get-Mailbox -Identity $item
    Write-Host "Now working on mailbox" $item -BackgroundColor Green
        for($i=($item.EmailAddresses.count)-1; $i -ge 0; $i--)
        {
        $address=$item.EmailAddresses[$i]
        $addressString=$address.addressString
            if($addressString -like "midas-kapiti.com")
            {
            $item.EmailAddresses.removeat($i)
              }
        }
    $item |set-mailbox -EmailAddresses $mailbox.EmailAddresses
    }
}

Many thanks guys & gals and appreciate any suggestions.

Regards

ScriptNoob