exception_class()
public
Determines whether there was an error and raises the appropriate error
based on the reply code of the response
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def exception_class
case @status
when /\A4/ then SMTPServerBusy
when /\A50/ then SMTPSyntaxError
when /\A53/ then SMTPAuthenticationError
when /\A5/ then SMTPFatalError
else SMTPUnknownError
end
end