2 ways instantly PowerShell to send email from SharePoint Online

CLS
#Load SharePoint CSOM Assemblies
#Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.dll"
#Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.Runtime.dll"

$fileName = "Email_Sending_Report"
$enddate = (Get-Date).tostring("yyyyMMddhhmmss")
$logFileName = $fileName +"_"+ $enddate+"_Log.txt"   
$invocation = (Get-Variable MyInvocation).Value  
$directoryPath = Split-Path $invocation.MyCommand.Path 

$directoryPathForLog=$directoryPath+"\"+"LogFiles"
if(!(Test-Path -path $directoryPathForLog))  
        {  
            New-Item -ItemType directory -Path $directoryPathForLog
            
        }   
        
$logPath = $directoryPathForLog + "\" + $logFileName  
$isLogFileCreated = $False 

#DLL location
$directoryPathForDLL=$directoryPath+"\"+"Dependency Files"
if(!(Test-Path -path $directoryPathForDLL))  
        {  
            New-Item -ItemType directory -Path $directoryPathForDLL
               
        } 

#DLL location
$clientDLL=$directoryPathForDLL+"\"+"Microsoft.SharePoint.Client.dll"
$clientDLLRuntime=$directoryPathForDLL+"\"+"Microsoft.SharePoint.Client.dll"

Add-Type -Path $clientDLL
Add-Type -Path $clientDLLRuntime
  
function Write-Log([string]$logMsg)  
{   
    if(!$isLogFileCreated){   
        Write-Host "Creating Log File..."   
        if(!(Test-Path -path $directoryPath))  
        {  
            Write-Host "Please Provide Proper Log Path" -ForegroundColor Red   
        }   
        else   
        {   
            $script:isLogFileCreated = $True   
            Write-Host "Log File ($logFileName) Created..."   
            [string]$logMessage = [System.String]::Format("[$(Get-Date)] - {0}", $logMsg)   
            Add-Content -Path $logPath -Value $logMessage   
        }   
    }   
    else   
    {   
        [string]$logMessage = [System.String]::Format("[$(Get-Date)] - {0}", $logMsg)   
        Add-Content -Path $logPath -Value $logMessage   
    }   
} 
#variables region.
$siteURL="https://globalsharepoint.sharepoint.com/sites/TestSite/"
$spUserName="yourSharePointonlineaccount@yourtenantdomain.com"
$BCCUserName = "Global-sharepoint@globalsharepoint.onmicrosoft.com"
$ccUserName = "Global-sharepoint@globalsharepoint.onmicrosoft.com"
$toUserName = "Global-sharepoint@globalsharepoint.onmicrosoft.com"
$emailBody = "Test email from SharePoint online CSOM PowerShell script." 
$password = "YourPassword"
#variables region end.
$securePassword= $Password | ConvertTo-SecureString -AsPlainText -Force
  
#Setup the Context
try
{
$ctx = New-Object Microsoft.SharePoint.Client.ClientContext($siteURL)
$ctx.Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($spUserName, $securePassword)  
$clientCSOMEMailProperties=New-Object Microsoft.SharePoint.Client.Utilities.EmailProperties        
$clientCSOMEMailProperties.BCC= [Collections.Generic.List[String]]@($BCCUserName) 
$clientCSOMEMailProperties.CC=[Collections.Generic.List[String]]@($CCUserName) 
$clientCSOMEMailProperties.To=[Collections.Generic.List[String]]@($ToUserName) 
$clientCSOMEMailProperties.From=$spUserName 
$clientCSOMEMailProperties.Body=$emailBody
$clientCSOMEMailProperties.Subject="Test email from SharePoint online CSOM PowerShell script." 
$csomUtility=[Microsoft.SharePoint.Client.Utilities.Utility]::SendEmail($ctx, $clientCSOMEMailProperties)        
$ctx.ExecuteQuery() 
$ctx.Dispose() 
}
catch 
{
  
    $errorMessage = $_.Exception.Message +"in sending email from CSOM SharePoint online";
    Write-Host $errorMessage -BackgroundColor Red
    Write-Log $errorMessage 
}         
Write-Host "##########################################################"
Write-Host "Test email from SharePoint online CSOM PowerShell script." -ForegroundColor Green 
Write-Host "##########################################################"

Send-PnPMail -To address@tenant.sharepointonline.com -Subject test -Body test

Send-PnPMail -To address@contoso.com -Subject test -Body test -From me@tenant.onmicrosoft.com -Password xyz

Send-PnPMail -To address@contoso.com -Subject test -Body test -From me@server.net -Password xyz -Server yoursmtp.server.net