param(
  [Parameter(Mandatory = $true)][string]$Smtp,
  [int]$Port = 465,
  [Parameter(Mandatory = $true)][string]$From,
  [Parameter(Mandatory = $true)][string]$To,
  [Parameter(Mandatory = $true)][string]$User,
  [Parameter(Mandatory = $true)][string]$Pass,
  [Parameter(Mandatory = $true)][string]$Subject,
  [Parameter(Mandatory = $true)][string]$Body
)

$ErrorActionPreference = 'Stop'
$secure = ConvertTo-SecureString $Pass -AsPlainText -Force
$cred = New-Object System.Management.Automation.PSCredential($User, $secure)

Send-MailMessage -SmtpServer $Smtp -Port $Port -UseSsl `
  -From $From -To $To -Subject $Subject -Body $Body `
  -Encoding UTF8 -Credential $cred