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Content Negotiation

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Mark Overmeer edited this page Apr 15, 2025 · 1 revision

RFC4141 (2005)

Introduction of SMTP statement CONPERM, and headers in the messages which describe how the message can be modified to please the receiver.

The MIME headers are

  • Content-Negotiation
  • Content-Convert
  • Content-Previous
  • Content-Features

This whole idea totally breaks with spam-protection mechanisms like DKIM, S/MIME, and so on. It may be used to attack resource use of the MTAs too. Shall not be used.

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