On 12/22/23 17:30, Vijay S Sarvepalli via Postfix-users wrote:
Arguably the second server is at fault
here for “SPF” signing two emails, nevertheless the vulnerability is due
to the combinatorial or Composition Attack as Wietse has identified.
SPF does not involve any per-message signatures. Did you perhaps mean
to say "DKIM" here?
- Bill
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