Gomes, Rich via Postfix-users:
> Asking the hive mind here...
>
> What is the best way to insert a multi-line value into a header via postfix?
Postfix does not support multiline text in parameter values, or in
header_checks/body_checks/access table actions. This prevents may
opportunties for misues (such as header CRLF injection attacks).
> We are trying to mimic an issue we are having with bad actors
> inserting fraudulent DKIM keys into a header in an attempt to spoof
> one of our domains.
They send email with a forged DKIM header? That requires they have
a signing key for one of your domains.
Wietse
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