Emails when a device starts replying to ICMP ping requests

EmailWhenUp.ps1

#EmailWhenUp.ps1
# Usage: ./EmailWhenUp.ps1 Computer01

Param([string]$ComputerName,[string]$mailServer,[string]$MailTo)

function isup {
Param([string]$ComputerName)

    Test-Connection -ComputerName $ComputerName -Count 1 -Quiet
}

while (isup $ComputerName -eq $false) {
    Write-Host "Still Down" -ForegroundColor Red
}

Write-Host "Up!" -ForegroundColor green

Send-MailMessage -SmtpServer $mailServer -Subject "$Computername is up!" -Body "$ComputerName is up now" -From $MailTo -To $mailTo