Linux - NetworkingThis forum is for any issue related to networks or networking.
Routing, network cards, OSI, etc. Anything is fair game.
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i received this email and i'm not really sure what they're talking about:
Quote:
I'm sending you this mail because one or more IP addresses in your domain
are currently attacking our electronic mail server with a denial of service
attack consisting of multiple, rapid attempts to send mail to randomly
generated, non-existent email addresses.
Please take action with regard to the below hosts immediately to stop this
worm or virus. This attack may be reported to the U.S Federal Bureau of
Investigation for criminal prosecution. These hosts may also have been
blacklisted from sending mail to our server.
anyone have any ideas on what i need to do/fix? The server it's referring to i think is my RH9 box...
Do you have a mail server on you Linux box or did you get this E-Mail from your address that your ISP gave you ?
If it came from your ISP ... delete it ... it's spam.
If you have a mail server on your Linux, look at your logs to see if you can find anything.
Yes.
If you have a lot of entries, try to update you version of Sendmail (I assume you use Sendmail).
I know that the version of Sendmail in RH9 distro have some security leaks, so maybe someone is using it...
Can't help much more with technicalities cause I'm not very good with mail servers...
(edited for spell check)
Last edited by denver1980; 12-28-2004 at 05:14 PM.
FWIW: I configure my firewall to ONLY allow the IP address of my postfix MTA outbound SMTP connections. With this type of configuration - should a virus that installs a local MTA on a windows box try to send its crap... it gets blocked at the firewall.
Something you might want to consider for future reference
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