Remove.ps1

#Remove-MailQueueObjects.ps1
Param(
    $Path = "D:\tst",
    $pattern = "TextString",
    $filter = "*.eml"
}

Get-ChildItem -Recurse -Path $Path -File -Filter $filter |
    where {
        get-content $psitem.fullname -ReadCount 0 |
            select-string $pattern -Context 0,1
    } |
    foreach {
        Remove-Item $psitem -WhatIf
        Remove-Item "$(join-path $psitem.Directory $psitem.BaseName).metadata" -whatif
    }