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	کد HTML:
	System.FormatException: The specified string is not in the form required for an e-mail address.
   at System.Net.Mail.MailAddressParser.ParseAddress(String data, Boolean expectMultipleAddresses, Int32& index)
   at System.Net.Mail.MailAddressParser.ParseAddress(String data)
   at System.Net.Mail.MailAddress..ctor(String address, String displayName, Encoding displayNameEncoding)
   at Mail.send_mail(String user_name, String pass, String smtp_server, Boolean ssl_mode, String send_to, String subject, String body
 )