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290406Re: using the character @ in the local part

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  • Wietse Venema
    Jan 4, 2013
      Michael Blessenohl:
      > The security issue is, as far as I understand, that a backup MX uses an
      > @ in the local part for internal purposes. Which, in theory, can be
      > exploited to use the server as open relay. As long as I don't use a
      > backup MX, I don't have an open relay and everything is fine, isn't it?

      Come on, don't be so naive. The backup MX scenario is an EXAMPLE
      of how @ in local-part can result in trouble. The same problem may
      happen in ANY piece of software that decisions based on the content
      of an email address.

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