Friday, January 1, 2010

501 SYNTAX ERROR IN PARAMETERS OR ARGUMENTS

If you are forwarding your mail trough some sort of SSH tunnel or Proxy and have your SMTP server set to "localhost", you may get the following error message:

501 SYNTAX ERROR IN PARAMETERS OR ARGUMENTS

The problem is that the SMTP server is using a reverse DNS lookup and is not able to associate localhost with your host name for some reason.  Instead try sending mail by IP address (127.0.0.1).

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