Test-StartTLS.ps1

[CmdletBinding()]
param (
    [Parameter(Mandatory)]
    [string]
    $Server,

    [Parameter(Mandatory)]
    [string]
    $To,

    [Parameter(Mandatory)]
    [string]
    $From,

    [Parameter()]
    [string]
    $Subject = "Test",

    [Parameter()]
    [string]
    $Body = "Test",

    [Parameter()]
    [switch]
    $DisableTLS
)

$msg = New-Object System.Net.Mail.MailMessage($From, $To)
$msg.Subject = $Subject
$msg.Body = $Body

$client = New-Object System.Net.Mail.SmtpClient($Server)
if (-not $DisableTLS) {
    $client.EnableSsl = $true
}

$client.Send($msg)

# If this generates an error use the following command to see the details:
# $Error[0] | fl * -force