[Kolab-devel] [merge70] Reject code of SMTP to reduce overhead of the system respect to SPAM activity

[Fabio Pietrosanti]

New submission from Fabio Pietrosanti <fp at khamsa.ch>:

# Be aggressive in terms of rejection of unauthorized emails
unverified_sender_reject_code = 550
unverified_recipient_reject_code = 550
unknown_address_reject_code = 550
unknown_local_recipient_reject_code = 550
unknown_client_reject_code = 550
unknown_hostname_reject_code = 550

450 simply keep more stuff in the queue of broken systems in my own experience.

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nosy: khamsa
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title: Reject code of SMTP to reduce overhead of the system respect to SPAM activity
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