Viktor Dukhovni via Postfix-users:
> - Postfix 3.9 (pending official release soon), rejects unuthorised
> pipelining by default: "smtpd_forbid_unauth_pipelining = yes".
>
> - Postfix 3.8.1, 3.7.6, 3.6.10 and 3.5.20 include the same supporting
> code as 3.9 snapshots, but the "smtpd_forbid_unauth_pipelining"
> parameter defaults to "no".
Indeed, setting "smtpd_forbid_unauth_pipelining = yes" prevents
Postfix from accepting a smuggled message after it has allowed a
malformed end-of-data.
This has the potential to break mail from poorly-implemented clients,
just like a stricter enforcement of <CR><LF> line boundaries would.
wietse
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