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Old 09-15-2003, 09:29 PM   #1
lzyking
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Registered: Dec 2002
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how to refuse to send email to some domain with sendmail?


My sendmail server recently gets the maillog like this:

Sep 16 08:36:36 linux sendmail[1961]: h8EIKbmM026822:

to=<l48yg.cuygm@softhome.net>, delay=16:42:14, xdelay=00:00:00,

mailer=esmtp, pri=1385829, relay=mx0a.softhome.net., dsn=4.0.0,

stat=Sent
-----------------------------
and the load average of the mail server always is about 24 , and CPU used by system or user is at 80%, so I think that is because the user of my company is sending virus email to some domain like @softhome.net , is that right? (there are plenty of this kind of record in maillog file)

If this is right ,can I do something to refuse people of my company to send the virus email to that domain with my sendmail server?

please help me!
 
Old 09-16-2003, 01:40 AM   #2
michelvd
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Registered: Feb 2003
Location: Bilthoven
Distribution: RedHat / Debian
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Hi,

you can add a line 'to:softhome.net REJECT' to your /etc/mail/access file. Rebuild the file with 'makemap hash /etc/mail/access < /etc/mail/access' and reload sendmail, that should do the trick.
 
Old 09-16-2003, 08:12 AM   #3
lzyking
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thanks michelvd, but I found that there are a lot of address I will add to the file access , I mean perhaps I have 200 addresses that I must to reject , is this the right way I fix the problem?

By the way ,I found the mail server always sent mail after come off work , and there is no pc working at that time ,dose it mean the mail my email server sent is not virus email? what can I do for this?

When I check my maillog ,I can't find record such as "from" , I just got the record such as a lot of "to " , does it mean the email is sent by my company's user?

please help me ! thanks
 
Old 09-16-2003, 09:21 AM   #4
michelvd
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[QUOTE]Originally posted by lzyking
[B]thanks michelvd, but I found that there are a lot of address I will add to the file access , I mean perhaps I have 200 addresses that I must to reject , is this the right way I fix the problem?

It is _a_ way, we use it for the same purpose, although its the other way round, to block mail from certain domains. If you think the mails are virusses, have a look at amavis or another viruskiller.

By the way ,I found the mail server always sent mail after come off work , and there is no pc working at that time ,dose it mean the mail my email server sent is not virus email? what can I do for this?

That is possible, maybe some mail couldn't get deliverd right away and the mailserver is retrying. Do you send mail to a smarthost or not (sendmail.cf -> DS)

When I check my maillog ,I can't find record such as "from" , I just got the record such as a lot of "to " , does it mean the email is sent by my company's user?

There are always from: lines, but it could be your users are sending mail to many addresses and they get lost in the to: lines can you do a grep on the maillog ?
 
  


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