Does anyone know if it's possible to have Dovecot or Postfix output the mail client of a user? In Dovecot's variables list, I cannot find anything in that direction.
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In postfix you could use header checks, something like
/^X-Mailer:/ WARN
would probably do the trick. Note that this header is easily (and often...) forged or may not be present at all.
Gryphius
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