Date: Fri, 17 Nov 2006 11:26:09 +0100 From: Per Engelbrecht <none@per--xterm.dk.lh.bsd-dk.dk> To: bsd-dk@bsd-dk.dk Subject: Spam problem ifb. m. falsk 'Return-Path' (Sendmail MTA)
Hej Alle,
(N.B. dette er ikke en Sendmail feature eller et Sendmail problem, men
generel info om setup kan ses nederst).
Det sidste doegns tid har jeg oplevet en voldsom stigning i modtagelse
af replies/bounces paa mails der er afsendt med vilkaarlig og falsk
<none@bruger--.lh.bsd-dk.dk> paa et af mine domainer. Det er kun dette ene domain der
rammes, men det rammes tilgengaeld med snart 700 mail pr. time fra alle
mulige steder i verden.
Skal jeg pege paa noget der kan minde om en faellesnaevner, saa er det
at hovedparten af mails afsendes eller passerer .it eller .ru
Det er som sagt ikke spam jeg modtager, men "reele" svar fra
hvemsomhelst der har modtaget en mail fra en ikke eksisterende bruger /
et af mine domainer som afsender.
Mit setup er patchet fra top til bund.
Er der nogen der har en ide til hvordan det kan stoppes ?!
Alle forslag modtages med kyshaand.
Det bedste til alle,
/per
OS:
OpenBSD 3.9
MTA:
Sendmail Version 8.13.6 Compiled with: DNSMAP LOG MAP_REGEX MATCHGECOS
MILTER MIME7TO8 MIME8TO7 NAMED_BIND NETINET NETINET6 NETUNIX NEWDB NIS
PIPELINING SCANF STARTTLS TCPWRAPPERS USERDB XDEBUG.
.mc settings:
...
define(`confPRIVACY_FLAGS',
`authwarnings,needmailhelo,needvrfyhelo,restrictexpand,restrictqrun,noetrn,novrfy,noexpn,nobodyreturn')dnl
...
- med de smtp maessige plusser og minuser der foelger med ovenstaaende
privacy_flags, saa er de settings ikke nogen jeg har umiddelbart har
lyst til at aendre. Er taget med som info.
P.S. Via min 'access' liste sorterer jeg alle kinesiske og koreanske
IP'er fra. Orginalen kan hentes paa:
http://okean.com/thegoods.html
Listen herunder er tilpasset Sendmail og er indsat til fri afbenyttelse.
Enjoy.
...
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...
--"The most worth-while thing is to try to put happiness into the lives of others."
- Sir Robert Baden-Powell
This archive was generated by hypermail 2b30 : Thu 30 Nov 2006 - 23:00:03 CET