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Windows Server Forum / Small Business Server / SBS 2000 / January 2004

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Autoreply during major virus outbreak (novarg/mydoom)

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Darwood - 29 Jan 2004 09:59 GMT
Could everybody please turn off their autoreply on their virus scanner. It
is totally getting on my nerves. I am not receiving any actual viruses just
tonnes of notifications from postmasters about a virus I do not have. This
virus is obviously spoofing the source email address and autoreply is
possibly unwittingly contributing to the spread of the virus. When you reply
to a system that might not have been infected with the original infected
message you risk infecting a new system. Unless your antivirus software is
clever enough to know the real source please do me a favour and turn it off.

--
Darwood MCSE

Remove nospamme from email address to reply.
Hiram Hackenbacker - 29 Jan 2004 10:13 GMT
>Could everybody please turn off their autoreply on their virus scanner.

OK - turning it off now.  Let me know when I can put it back on again
:-)

Signature

Hiram Hackenbacker

Javier Gomez [SBS MVP] - 29 Jan 2004 13:34 GMT
Darwood,

This is probably not the AV autoreply (since I don't know of any AV program
that sends back the still-infected message). What you see are Non Delivery
Reports (NDRs) from different mailservers. This is not an AV program
thing... but an general mail server thing. How else you would know if you
sent a message to a wrong address?

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Javier [SBS MVP]

<< SBS ROCKS !!! >>

> >Could everybody please turn off their autoreply on their virus scanner.
>
> OK - turning it off now.  Let me know when I can put it back on again
> :-)
Javier Gomez [SBS MVP] - 29 Jan 2004 13:36 GMT
>>Could everybody please turn off their autoreply on their virus scanner.
>
> OK - turning it off now.  Let me know when I can put it back on again

Do you want us to turn off NDR notifications also? :-)

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Javier [SBS MVP]

<< SBS ROCKS !!! >>

Darwood - 29 Jan 2004 13:45 GMT
Whoa! I'm not pretending to know more than the MVP's etc here I just think
it's a good idea. I got the idea from here
http://searchsecurity.techtarget.com/originalContent/0,289142,sid14_gci94642
3,00.html
"Administrators should have policies in place to turn off notification of
invalid e-mail addresses during major worm outbreaks, Dunham said. In fact,
Mydoom's creator may have intentionally created the worm so it would bog
down mail systems."

I would say NDR's should be turned off too. If anyone thinks this is a bad
idea please jump in.

Later all

--
Darwood MCSE

Remove nospamme from email address to reply.

> >>Could everybody please turn off their autoreply on their virus scanner.
> >
[quoted text clipped - 6 lines]
>
> << SBS ROCKS !!! >>
Javier Gomez [SBS MVP] - 29 Jan 2004 14:07 GMT
No... I understand what you are saying and I agree (except for the NDRs). I
do not send people notifications that they sent me a virus-infected mail...
thats plain dumb (I don't even know why some AV packages have that feature).

What I'm saying (on my first post) is that what you are probably seeing are
NDRs. That is definitely something that you shouldn't turn off. Let's say I
send you a important business proposal (just like the one from the late wife
of the president of Nigeria*) and I misspell you name... I WANT an email
back saying that you didn't get the message (else I would think you are not
taking me seriusly).

[For some reason my first post appeared later than the 2nd one]

* - This is joke BTW :-)

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Javier [SBS MVP]

<< SBS ROCKS !!! >>

> Whoa! I'm not pretending to know more than the MVP's etc here I just think
> it's a good idea. I got the idea from here

http://searchsecurity.techtarget.com/originalContent/0,289142,sid14_gci94642
> 3,00.html
> "Administrators should have policies in place to turn off notification of
[quoted text clipped - 22 lines]
> >
> > << SBS ROCKS !!! >>
Hiram Hackenbacker - 29 Jan 2004 13:48 GMT
>>>Could everybody please turn off their autoreply on their virus scanner.
>>
>> OK - turning it off now.  Let me know when I can put it back on again
>
>Do you want us to turn off NDR notifications also? :-)

You forgot that I smiled also.  You need to direct your question to
the original poster.

Signature

Hiram Hackenbacker

Javier Gomez [SBS MVP] - 29 Jan 2004 14:00 GMT
> You forgot that I smiled also.  You need to direct your question to
> the original poster.

I know... I was also joking. For some reason my first post appeared later
than the 1st.

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Javier [SBS MVP]

<< SBS ROCKS !!! >>

Darwood - 29 Jan 2004 15:25 GMT
Sorry I didn't realise you guys were being sarcastic. I am from Wales where
we don't have such a thing. Obviously Ken Dunham is as in the dark here as I
am.
I am getting the autoreplies and the NDR's. Whilst the autoreplies don't
contain the virus they are mildly annoying. However the NDR's seem to be far
outweighing the autoreplies at the moment. If we can turn the NDR off as
well why not? As Javier alluded most of the email these days is useless
anyway. Is it better to miss the odd email from someone (during the high
activity period) who can't type my name or to contribute to the propagation
of this virus?
--
Darwood MCSE

Remove nospamme from email address to reply.

> > You forgot that I smiled also.  You need to direct your question to
> > the original poster.
[quoted text clipped - 6 lines]
>
> << SBS ROCKS !!! >>
Hendrik Cannoodt - 29 Jan 2004 15:33 GMT
There should be a way to send a NDR, but delete the attachment. That way,
nobody could get infected by it, and it saves bandwith. If anybody knows how
to do this on SBS, let me know. I looked for it a while ago, but couldn't
find it.

HC

> Sorry I didn't realise you guys were being sarcastic. I am from Wales
> where we don't have such a thing. Obviously Ken Dunham is as in the
[quoted text clipped - 17 lines]
>>
>> << SBS ROCKS !!! >>
Hendrik Cannoodt - 29 Jan 2004 15:30 GMT
Question is, why can't the AV software have a parameter linked to the
definition, so that it would know when to send an alert to the sender, and
when not.
Should be a very easy thing to make, but haven't seen it yet. If anybody has
that option in their AV, please let me know.

HC

>> Could everybody please turn off their autoreply on their virus
>> scanner.
>
> OK - turning it off now.  Let me know when I can put it back on again
> :-)
Darwood - 29 Jan 2004 15:39 GMT
> Question is, why can't the AV software have a parameter linked to the
> definition, so that it would know when to send an alert to the sender, and
> when not.
> Should be a very easy thing to make, but haven't seen it yet. If anybody has
> that option in their AV, please let me know.

The NDR comes from Exchange rather than the AV doesn't it? It would have to
be Exchange that had the option then I presume?
Darwood - 29 Jan 2004 16:09 GMT
> > Question is, why can't the AV software have a parameter linked to the
> > definition, so that it would know when to send an alert to the sender, and
[quoted text clipped - 5 lines]
> The NDR comes from Exchange rather than the AV doesn't it? It would have to
> be Exchange that had the option then I presume?

From KB324636
Turn Off Non-Delivery Reports and Delivery Reports
To turn off non-delivery reports or delivery reports, follow these steps:
 1.. Start Exchange System Manager.
 2.. Expand Global Settings, and then click Internet Message Formats.
 3.. Right-click Default, click Properties, and then click the Advanced
tab.
 4.. Do either of the following:
   a.. To prevent non-delivery reports from being sent, click to clear the
Allow non-delivery reports check box.
   b.. To prevent delivery reports from being sent, click to clear the
Allow delivery reports check box.
Javier Gomez [SBS MVP] - 29 Jan 2004 16:29 GMT
I think that doing that even stop internal NDRs... so be careful.

Signature

Javier [SBS MVP]

<< SBS ROCK!!! >>

> > > Question is, why can't the AV software have a parameter linked to the
> > > definition, so that it would know when to send an alert to the sender,
[quoted text clipped - 20 lines]
>     b.. To prevent delivery reports from being sent, click to clear the
> Allow delivery reports check box.
Darwood - 29 Jan 2004 17:37 GMT
> I think that doing that even stop internal NDRs... so be careful.

You mean from an internal user to an internal user?

--
Darwood MCSE

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Javier Gomez [SBS MVP] - 29 Jan 2004 18:35 GMT
> You mean from an internal user to an internal user?

Those too... but I was referring if you send something to another domain and
the other domain doesn't exist (or because you mispell it) your Exchange box
cannot contact the other domain and the NDR is not produced (so you never
know what happened).

I'm not 100% sure about this (I don't disable NDRs)... but I recall reading
that on a thread by Chad and Les (I think) a couple of days go.

Signature

Javier [SBS MVP]

<< SBS ROCK!!! >>

David Elders - 29 Jan 2004 16:07 GMT
Hi all,

Here's one for all you new [and old] MVPs! We all love you and we hope you
all know!

SBS2k set-up to add disclaimers to outgoing mail as per smallbizserver.net
instructions - working fine. We have a single customer who we are having
problems sending email to - error message we get is:

You do not have permission to send to this recipient. For assistance,
contact your system administrator.
<OurServer#5.7.1 smtp;501 5.7.1 <sender's email address>... Sender refused
by the DNSBL - MAIL REJECTED - DYNAMIC IP RANGE - RELAY VIA YOUR PROVIDER
(SORBSDUL)>

Now we have a cable modem set-up with dynamic [although constantly updating]
IP address. In effect it's static although not guaranteed as such. Our
outgoing email is sent via DNS through Exchange 2k. We're happy with that
but what I want to find out is if it is possible for us to send outgoing
emails to this particular recipient's domain via our ISPs mail servers
rather than via DNS, but only for them.

Had a dig around and [probably because its been a long - and not good! - day
thus far] haven't managed to figure it out - would I be right in assuming
we'd have to configure a smart host of some kind?

Regards,

David

> Could everybody please turn off their autoreply on their virus scanner. It
> is totally getting on my nerves. I am not receiving any actual viruses just
[quoted text clipped - 9 lines]
>
> Remove nospamme from email address to reply.
Javier Gomez [SBS MVP] - 29 Jan 2004 16:18 GMT
Hi David!

You can use a Smarthost only for that ISP. I'm preparing a small document
which explains how to set this up... you can download it here:
http://www.inqu.net/Smarthost.zip

[Check the How do I set this up / Smarthost for specific domains section]

Please be aware that this is still in beta... any corrections and/or
comments will be greatly appreciated.

Thanks!

Signature

Javier [SBS MVP]

<< SBS ROCK!!! >>

> Hi all,
>
[quoted text clipped - 42 lines]
> >
> > Remove nospamme from email address to reply.
David Elders - 29 Jan 2004 16:39 GMT
Thanks Javier,

Just realised I hit 'reply group' instead of 'new post' - been one of THOSE
days...! Apologies to all for any confusion.

Cheers again,

David

> Hi David!
>
[quoted text clipped - 65 lines]
> > >
> > > Remove nospamme from email address to reply.
Darwood - 29 Jan 2004 17:00 GMT
Excellent document Javier.

--
Darwood MCSE

Remove nospamme from email address to reply.

> Hi David!
>
[quoted text clipped - 3 lines]
>
> [Check the How do I set this up / Smarthost for specific domains section]
Javier Gomez [SBS MVP] - 29 Jan 2004 23:44 GMT
Thanks to both!

Signature

Javier [SBS MVP]

<< SBS ROCKS !!! >>

> Excellent document Javier.
>
[quoted text clipped - 10 lines]
> >
> > [Check the How do I set this up / Smarthost for specific domains section]
Darwood - 29 Jan 2004 16:20 GMT
Sounds like your customer could have been blacklisted as an open relay.

--
Darwood MCSE

Remove nospamme from email address to reply.

> Hi all,
>
[quoted text clipped - 25 lines]
>
> David
billyw - 30 Jan 2004 00:17 GMT
have a customer with similiar issue..
all the tests say they aren't an open relay and settings say they aren't but
looks like spamcop have them down as such.
i did turn off the NDR's as they were mounting up to daft amounts.

> Sounds like your customer could have been blacklisted as an open relay.
>
[quoted text clipped - 34 lines]
> >
> > David
Robert - 29 Jan 2004 20:39 GMT
Anyone know how to modify the NDR messages or do Inbound Recipient filtering
on Exchange 2000?

Robert

> Could everybody please turn off their autoreply on their virus scanner. It
> is totally getting on my nerves. I am not receiving any actual viruses just
[quoted text clipped - 9 lines]
>
> Remove nospamme from email address to reply.
Darwood - 30 Jan 2004 08:58 GMT
GFI MailEssentials can blacklist an internal address so it deletes the mail
before you see it but you if it is against novarg you will be chasing your
tail as the name prefix before the domain seems to be different all the
time.

--
Darwood MCSE

Remove nospamme from email address to reply.

> Anyone know how to modify the NDR messages or do Inbound Recipient filtering
> on Exchange 2000?
[quoted text clipped - 17 lines]
> >
> > Remove nospamme from email address to reply.
Pie Man - 31 Jan 2004 16:56 GMT
Why are these auto virus replies inteligent? If they knew which viruses used spoofed addresses and didn't reply to those then people wouldn't  have to worry about turning them off. I mean it is not as if this is a sudden thing, it must be at least two years since a major virus used the proper email address of the infected person....
 
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