Powershell script to check if a process is running, if not start and send an email

I have a script that has been modified from other forums to check a process and start it if it's not running. After it starts the program it sends and email, I don't know how to get it to send an email only if it has to start the program... if it's already running I don't want it to send an email.  I am very new to power shell and don't understand a lot of the functions, any help would be appreciated.

Thanks,

This is  copy of what i'm using to test

# PowerShell script with e-mail notification


# Change these values

$myproc = "SwithMail.exe"
if (!(gps SwithMail -ea 0)) {
    $MyProcCMD = "C:\SwithMail"  #<-- cmd to start proc
    $wmi = ([wmiclass]"win32_process").Create($MyProcCMD)
    if ($wmi.returnvalue -eq 0) {
    }
    }
    
$EmailFrom = "me@me.com"
$EmailTo = "me@me.com
$EmailBody = "Process test to start process and send email."
$EmailSubject = "Process Test"
$Username = "any@any.com"
$Password = "password"



# Send E-mail message with log file attachment
$Message = New-Object Net.Mail.MailMessage($EmailFrom, $EmailTo, $EmailSubject, $EmailBody)

$SMTPClient = New-Object Net.Mail.SmtpClient("smtp.gmail.com", 587)
$SMTPClient.EnableSsl = $true
$SMTPClient.Credentials = New-Object System.Net.NetworkCredential($Username, $Password);
$SMTPClient.Send($Message)