Powershell script errors logs to send email

i am new to the powershell scripting and at learnig stage.
i have scripts it works (experts helped me move on further)....it checks for file, upload the file in ftp.
i have written function to send email when process complete and also capture the errors and send email error alert.
i noticed the status email works with sending attacment and failure email alerts just capturing ERROR word but not sending email alert...
Like to request for help..
I want email alerts to come body message to have errors captured ? or if possible the log file context to write in the email body.
Also like to check what more parameters to set so that we get errors alerts in the log...for timeout ,username password wrong etc...Modify_Script.ps1Modify_Script.ps1



#Requires -version 3.0
$WarningPreference="Continue"

#variables
$ScriptPath = $(Split-Path -Parent $MyInvocation.MyCommand.Definition)

# Load WinSCP .NET assembly
[Reflection.Assembly]::LoadFrom( $(Join-Path $ScriptPath "WinSCPnet.dll") ) | Out-Null

#Log Timestamp
$date=Get-Date -Format ddMMMyyyyHHmmss
$logdate=Get-Date -Format ddMMMyyyy_HHmmss
$emaildate=Get-Date -Format dd/MM/yyyy_HH:mm:ss
$Logfile = "E:\INT\Log\Daily_$logdate.txt"

function LogWrite ([string]$logstring)
{  
   Add-content $Logfile -value $logstring
}
LogWrite ("$( Get-Date -Format "yyyy-MM-dd HH:mm:ss" ) START:`t"+"File Processing BEGIN`n")

#Zip Files and move to backup folder
$sourcefolder="E:\INT\PUT"
$backupFolder="E:\INT\Archive"

#check if source folder exists
if(!(Test-Path $sourcefolder)){
    $msj="The source folder ""$($sourcefolder)"" doesn't exists. Exiting..."
    LogWrite "$( Get-Date -Format "yyyy-MM-dd HH:mm:ss" ) ERROR:`t$msj"
    LogWrite -ForegroundColor Red $msj
    exit -1
}

#check if source files exists

$files   = 'CAT.xml', 'BAT.xml', 'RAT.xml'
$success = $true
foreach( $file in $files )
{
       $filename = Join-Path $sourcefolder $file
       if( Test-Path -LiteralPath $filename )
       {
              LogWrite "$( Get-Date -Format "yyyy-MM-dd HH:mm:ss" ) FILECHECK:`tFile exists: $filename"
       }
       else
       {
              $msj = "The source file '$fileName' doesn't exist"
              LogWrite "$( Get-Date -Format "yyyy-MM-dd HH:mm:ss" ) ACTION REQUIRED:`t$msj"
              $success = $false
       }
}
if( -not $success  )
{
    LogWrite "$( Get-Date -Format "yyyy-MM-dd HH:mm:ss" ) The mandatory files not found in the source directory hence the ODIN job process has been cancelled"
    sendError
    exit -1
}

function sendError() {
     Write-Host "Sending Email File Transfer Error Alert @ $emaildate"
     $smtpServer = "mailserver.mail.com"
     $msg = new-object Net.Mail.MailMessage
     $smtp = new-object Net.Mail.SmtpClient($smtpServer)
     $msg.From = "donotreply@mail.com"
     $msg.To.Add("admin@mail.com")
     $msg.subject = "ACTION REQUIRED : Error Alert @ $emaildate"
     $msg.Attachments.Add($Logfile)
     $msg.Body = "Dear All,
Please refer the attachment of errors
Regards,
Job Process"
$smtp.Send($msg)
}

function sendstatus() {
     Write-Host "Sending Email File Processing Sucess Alert @ $emaildate"
     $smtpServer = "mailserver.mail.com"
     $msg = new-object Net.Mail.MailMessage
     $smtp = new-object Net.Mail.SmtpClient($smtpServer)
     $msg.From = "donotreply@mail.com"
     $msg.To.Add("admin@mail.com")
     $msg.subject = "INFO : Sucess Alert @ $emaildate"
     $msg.Attachments.Add($Logfile)
     $msg.Body = "Dear All,
Please refer the attachment
Regards,
Job Process"
     $smtp.Send($msg)
}
try
{
# Set up session options
    $sessionOptions = New-Object WinSCP.SessionOptions
    $sessionOptions.Protocol = [WinSCP.Protocol]::Ftp
    $sessionOptions.HostName = "ftp.com"
    $sessionOptions.PortNumber = 854
    $sessionOptions.UserName =  $config.Configuration.UserName
    $sessionOptions.Password = Decrypt-String $key $config.Configuration.Password
    $sessionOptions.FtpSecure = [WinSCP.FtpSecure]::Implicit
    $sessionOptions.TlsHostCertificateFingerprint='BF:BC:BV:AZ:AQ:AC:AX:AS:GD:DF:WS:KS:MG:9H:IL:ID:KS:DG:AB:ZX'
    $session = New-Object WinSCP.Session
try
    {
        # Connect    
        $localPath =  "E:\INT\PUT\*"
        $remotePath = "/Upload/to/"
        $backupPath = "E:\INT\Archive\"
        # Upload files, collect results
        $session.Open($sessionOptions)
        $transferResult = $session.PutFiles($localPath, $remotePath)
        # Iterate over every transfer
        foreach ($transfer in $transferResult.Transfers)      
        {
            # Success or error?
            if ($transfer.Error -eq $Null)
            {              
                LogWrite ("$( Get-Date -Format "yyyy-MM-dd HH:mm:ss" ) UPLOAD:`t"+"UPLOAD file {0} succeeded   " -f $transfer.FileName + "   Server Path   " + $transfer.Destination)
                # Upload succeeded, move source file to backup
                $fileWithOutExt = [io.path]::GetFileNameWithoutExtension($transfer.FileName)
                $MoveFile1 = "$backupPath\$($fileWithOutExt)_$date.p7"
                Move-Item $transfer.FileName $MoveFile1
                LogWrite ("$( Get-Date -Format "yyyy-MM-dd HH:mm:ss" ) ARCHIVE:`t"+"Moving file {0} succeeded   " -f $MoveFile1)
            }
            else
            {
                LogWrite ("Upload of {0} failed: {1}" -f
                    $transfer.FileName, $transfer.Error.Message)
            }
     
        }
       
    }
catch [Exception]
{
    LogWrite $_.Exception.Message
    sendError
    exit 1
}

}
    finally
    {
        # Disconnect, clean up
        LogWrite ("`n$( Get-Date -Format "yyyy-MM-dd HH:mm:ss" ) END:`t`t"+"File Processing ENDED.")
        $session.Dispose()
        sendstatus
    }
exit 0