relay server a neexistujici uzivatele

[Petr Novotny]

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On 27 Apr 00, at 8:22, Jan Satko wrote:

> To mam akoze upraveny sendmail ? Alebo ako ?

_Odesilatel_ (typicky spammer) nemusi vubec pouzivat zadny 
MTA. On ho typicky nepouziva. Pouziva nejaky jednoucelovy 
harvester; proste program, ktery se pres SMTP snazi protlacit co 
nejvice spamu. Tim, ze ignoruje 4xx a 5xx kody SMTP (temporary i 
permanent errory) a nedorucene maily (spamy) zahazuje, odpada 
mu sprava fronty (a znacny I/O overhead s ni spojeny) a je ve 
spamovani omezen ciste jen sirkou pasma. [On stejne ten 
spammer za par hodin az dni prijde o konto, takze proc se 
zatezovat pokusy o opakovane doruceni, ze.]

Mimochodem, upravit sendmail nebo jiny MTA, aby res_query() 
delal malinko jinak, je trivialni. A upravit resolver tak, aby kecal v 
tom, co vrati, tez.

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--
Petr Novotny, ANTEK CS
Petr.Novotny na antek.cz
http://www.antek.cz
PGP key ID: 0x3BA9BC3F
-- Don't you know there ain't no devil there's just God when he's drunk.
                                                             [Tom Waits]