Example of how to use Send-MailMessage with conditionally CC and BCC arguments

Example_SendMailScript.ps1

[string]$MailFrom = "me@domain.com"
[array]$MailTo = "you@domain.com", "other@domain.com"
[string]$MailSubject = "my subject"
[string]$MailBody = @"
<b>Heading</b>
Some text<br>
New Line with more text<br>
"@
[string]$MailServer = "smtp.domain.com"

[array]$MailCc = "optional@domain.com" # Don't know if this variable is set or not
[array]$MailBcc = "optional@domain.com" # Don't know if this variable is set or not

$MailArguments = @{
    From = $MailFrom
    To= $MailTo 
    Subject = $MailSubject 
    Body = $MailBody 
    BodyAsHtml = $True
    SmtpServer = $MailServer
    Encoding = [System.Text.Encoding]::UTF8
}
If($MailCc){$MailArguments.Add("Cc",$MailCc)}
If($MailBcc){$MailArguments.Add("Bcc",$MailBcc)}
Send-MailMessage @MailArguments