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How to stop SMTP sevice from replying to badmail?

How to stop SMTP sevice from replying to badmail?

The Pistoleer
12/3/2004 11:23:20 AM

iis smtp nntp:

I'm receiving thousands of emails every hour sent to some random
non-existing email address in my domain. The return addresses all seem to
be different, likely spoofed. The content is always spam.

It appears that my SMTP service (Server 2003 Standard, IIS) is sending a
non-delivery reply to all these messages. How can I stop these replies, I'd
rather these emails to non-existing names be just dropped.

Pete
http://www.Pistoleer.com Retail & Wholesale (PH/FX 618-288-4588)
_________________________________________________________________
A-Zoom snap-caps, Bore-Stores cases, Kleen-Bore gun care products
Official Targets, Pachmayr grips/pads, Trius traps, Target Stands
Leatherman, Lyman Reloading, HKS speedloaders, FREE classifieds

Re: How to stop SMTP sevice from replying to badmail?

Johan Karl Larsen
12/4/2004 2:47:30 AM

I don't think deleting the received bogus mail is the right way to go.
Probably better of getting a spamfilter. This will most likely stop the
bogus mail from _entering_ your system. Get a free filter from:
http://martijnjongen.com/Default.aspx?tabid=27

Do you have a sample header from such a mail?

--
Johan

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Re: How to stop SMTP sevice from replying to badmail?

m.marien
12/4/2004 4:51:06 PM

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I tend to agree with Pete. There should be a way to silently drop any
messages not intended for a local recipients. While the spamfilter may be
one solution, IMHO it's solving the wrong problem. The concern is not SPAM,
but sending NDR's when there is no obligation (or reason) for them.

In addition, spamfilters are not 100% reliable. There is the possibility of
stopping valid messages from reaching recipients with poor rules.

Silently dropping all messages not intended for local recipients saves the
hassle of trying to figure if it's SPAM and trying to send a NDR. Simple
problem - simple solution. A lot of other mail servers have this feature.

For a home grown solution, look at CDO and the OnArrival event. Whatever is
generating the NDR's will pass them on to the SMTP server for delivery. They
can be trapped by an OnArrival event sink and deleted before they are
delivered.

[quoted text, click to view]

Re: How to stop SMTP sevice from replying to badmail?

Craig Bricco
12/6/2004 10:24:50 AM

I tried to get an answer to this problem a month ago and none was
forthcoming. Luckily my support agreement with GFI entitled me to a free
upgrade to Mail Essentials 10.1 which they added a filter for non existent
email addresses on your domain.
I swear by this program and it stops about 85% of all incoming SPAM. If it
happens to catch a few good emails, you can direct all filtered mail to be
sent to a mail box for review, rather than just delete. No, not the answer
to the problem, but one has to do something other than just delete all the
crap from your inbox and tend to the bad mail folder.
Craig

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Re: How to stop SMTP sevice from replying to badmail?

Peter D. Hipson
12/8/2004 2:53:09 PM

What you are looking for is a catchall account. Do an internet search
and you should find something that will do the trick for you. With a
catchall, any email that does not have a mail-box will be dropped in
the catchall without further action.

On Sat, 4 Dec 2004 16:51:06 -0600, "m.marien" <mm AT RiverCityCanada
[quoted text, click to view]

PeterD, the Darkstar Network
To email, fix my address!

Re: How to stop SMTP sevice from replying to badmail?

m.marien
12/11/2004 4:38:01 PM

[quoted text, click to view]

Here is a script that will catch all the NDR's and silently drop them. It
only deletes the NDR's coming from your domain. Be sure to change the one
line wth the your.domain.name.here. You can delete the code that writes the
log file. It only helps to make sure it's working properly.

<SCRIPT LANGUAGE="VBScript">

Const cdoRunNextSink = 0
Const cdoSkipRemainingSinks = 1
Const cdoStatAbortDelivery = 2
Const cdoStatBadMail = 3

Sub IEventIsCacheable_IsCacheable()
' just returns S_OK
End Sub

Sub ISMTPOnArrival_OnArrival(ByVal Msg, EventStatus)

If Msg.Subject = "Delivery Status Notification (Failure)" and InStr
(Msg.From, "postmaster@your.domain.name.here") Then

Dim Flds
Set Flds = Msg.EnvelopeFields

Flds("http://schemas.microsoft.com/cdo/smtpenvelope/messagestatus") =
cdoStatAbortDelivery
Flds.Update

EventStatus = cdoSkipRemainingSinks

' write a log file --------------------------------------------
Dim fs
Set fs = CreateObject("Scripting.FileSystemObject")
Dim file
Set file = fs.OpenTextFile("C:\InetPub\ndr.log", 8, True )
file.Write "NDR deleted: " & Msg.To & vbCrLf
file.Close
' end of write a log file -------------------------------------

Else
EventStatus = cdoRunNextSink
End If

End Sub
</SCRIPT>

You can register the sink using the instructions here:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cdosys/html/_cdosys_sink_example_using_vbscript.asp

You need the "smtpreg.vbs" code from MS.

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