How to fetch event logs from a list of remote computers using powershell

Hello,

I have the below powershell script which i'm executing on a server, but when i'm receiving the email in my mailbox, sometimes i have blank emails with only the subject appearing as "EventLog OutputSERVERNAME System Error" or sometimes i get the content of the email but only the servename changes for each machine but not the content.

Please help me with the below script will be greatly appreciated.

param($argument1,$argument2)
$log = $argument1
$log_type = $argument2
$startdate = (get-date).adddays(-7)
$EmailFrom = "<noreply@test.com>"
$EmailTo = "<myaddress@domain.com>"
$SMTPServer = "127.0.0.1"

function send_email {
$mailmessage = New-Object system.net.mail.mailmessage 
$mailmessage.from = ($emailfrom) 
$mailmessage.To.add($emailto)
$mailmessage.Subject = $emailsubject
$mailmessage.Body = $emailbody
$mailmessage.IsBodyHTML = $true
$SMTPClient = New-Object Net.Mail.SmtpClient($SmtpServer, 25)  
$SMTPClient.Send($mailmessage)
}

$list = get-content server.txt #Server.txt file contains the list of all the machines which i'd like to have their logs sent to my email address
foreach ($i in $list) {
   $pc = $i.split(" ")
   $EmailSubject = "EventLog Output " + $pc + " " + $log + " " + $log_type
   $emailbody = Get-EventLog -ComputerName $pc -LogName $log -After $startdate -entrytype $log_type | Convertto-HTML
   send_email
}

$pc = ""
$log = ""
$log_type = ""
$startdate = ""
$eventlog = ""
$emailbody = ""

$EmailFrom = ""
$EmailTo = ""
$EmailSubject = ""  
$SMTPServer = ""
$list = ""
$i = ""
exit