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Old 03-18-2004, 04:51 PM   #1
Registered: Feb 2004
Posts: 50

Rep: Reputation: 15
Angry Sendmail smtpd being used for spam..

Hi, I think my smtp server has been used for spamming few hours ago. I received 55 emails from "Mail delivery subsystems", saying some random email cannot be sent to, for example:

The original message was received at Fri, 19 Mar 2004 00:13:54 +0800
from localhost
with id i2IGDsuR004496

----- The following addresses had permanent fatal errors -----
(reason: 553 VS10-RT Possible forgery or deactivated due to abuse (#5.1.1))

----- Transcript of session follows -----
... while talking to
>>> DATA
<<< 553 VS10-RT Possible forgery or deactivated due to abuse (#5.1.1)
550 5.1.1 User unknown
<<< 504 At least one RCPT command is required

I'm stil looking for a way to prevent this, but in case if anyone here know may help me out. In case if the server being used by spammer again.

By the way, is there a way to put in password for the smtp server? But if i do this, will it interfere with phpBB, since it will use smtp to email others, but I dont see it asking for password.

And is spamassassin the right answer for me? THanks.
Old 03-18-2004, 05:03 PM   #2
Registered: Feb 2004
Posts: 50

Original Poster
Rep: Reputation: 15
Oh yeah, and I'm using Slackware 91, with sendmail come out of the box.
Old 03-18-2004, 07:17 PM   #3
Registered: Feb 2004
Posts: 50

Original Poster
Rep: Reputation: 15
Hrm, I think I know what went wrong. In my /etc/access file, I have

localhost RELAY RELAY

Is it because of this that spammer can pipe through my mail server and use my server to send multiple email? I have removed all entries, except localhost and and in my local-host-names file, i have (and always have been):


And because in my mv i use FEATURE(use_cw_file), I have created with the same entries as local-host-names file.

Will this be enough to make sure spammer not using my email server as a pipeline?



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