From: Sascha Lucas (sascha.lucasrus.uni-stuttgart.de)
Date: Thu Oct 02 2003 - 05:26:44 CDT

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Wietse Venema schrieb:
>
> Sascha Lucas:
> > Hi list, Hi Wietse,
> >
Hi list, Hi Wietse,

Wietse Venema wrote:
> This happens ONLY if the MTA is down BEFORE Postfix has had a chance
> to find out if the recipient exists. Postfix maintains a cache of
> valid recipients, which eliminates this problem.

Ok I see, the cache will give a kind of safety. I desided to store the
address_verify_map. For testing now I think this will be ok. In the
README there is a warning about the filesize of the btree. How big will
this grow (in theorie) with approx. 50000 different mail-addresse?
 
> > Is there a possibility to accapt this mails like without
> > reject_unverified_recipient, when there is a network (TCP/IP) error? and
> > only reject them on SMTP-error?
>
> No, because that would make this feature completely useless. The
> queue would still fill up with undeliverable dictionary attack mail.

Ok I see, too. The amount off dictionary-probes is huge. so you had
first to block all recipient_addresses untill it can be verifyed as
positiv. Not the other way arround.

Thanks Sascha.

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