Already found a way to make it work!
$TextBody
$HTMLBody ;replace $as_Body with a text and html body
$rc = _INetSmtpMailCom($SmtpServer, $FromName, $FromAddress, $ToAddress, $Subject, $TextBody, $HTMLBody, $AttachFiles, $CcAddress, $BccAddress, $Importance, $Username, $Password, $IPPort, $ssl) ;add the new $TextBody and $HTMLBody to the $rc string
Func _INetSmtpMailCom($s_SmtpServer, $s_FromName, $s_FromAddress, $s_ToAddress, $s_Subject = "", $as_TextBody = "", $as_HTMLBody = "", $s_AttachFiles = "", $s_CcAddress = "", $s_BccAddress = "", $s_Importance="Normal", $s_Username = "", $s_Password = "", $IPPort = 25, $ssl = 0) ;also add them both to the _InetCOM
;Replace in the _InetCOM:
If StringInStr($as_Body,"<") and StringInStr($as_Body,">") Then
$objEmail.HTMLBody = $as_Body
Else
$objEmail.Textbody = $as_Body & @CRLF
EndIf
;With:
$objEmail.HTMLBody = $as_HTMLBody
$objEmail.Textbody = $as_TextBody & @CRLF