* Wietse Venema <wie...@porcupine.org>: > Stefan Foerster: > > What happens after "gate" has tried to validate more than > > "$smtpd_soft_error_limit" invalid recipients? Will it be slowed down? > > Is it possible to exclude "gate" from that artificial slowdown on > > "hub" using smtpd_client_event_limit_exceptions? > > > > Disclaimer/for the archive: In cases like that, it's probably much > > better to provide a list of valid recipients to "gate". > > Tarpit delays by the hub will slow down the dictionary attack. > Is that a problem?
It can delay legitimate mail with yet unverified recipients, but that's pretty much what one would suspect during a dictionary attack. Other than that, I cannot think of any scenario where this might become a real problem (it might confuse postmasters/admins who are not used to seeing a large number of mails with $address_verify_sender in their queues). It would still be nice to know whether smtpd_client_event_limit_exceptions will prevent the additional delays. Stefan
