Dear Friend,

I'm using windows 2000 advanced Server with IIS 5.0 running smtp service for
route the e-mail to our client...Smtp service is working and route e-mail to
my client without any problem since yesterday...Sudenly smtp service not
route the E-mail and I found lot of un-nessary e-mail in "Queue" and
"Badmail" folder..it seems spam mail more than 90,000 mail on the
folder...after delete the folder and re-create then smtp working fine...Can
you someone give the suggestion to protect the un-nessary e-mail store in
Queue folder in InetPub..!

1) How to protect the un-nessary E-mail ?

2) Is it any seeting should do on Default SMTP in IIS?

3) Already I enabled anonymous access..but if i disabled then
smtp can't route the E-mail.. !

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I suppose now your server is some kind of open relay. You should fix it as
described below.

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If you have only one SMTP virtual server, that is the SMTP virtual server to
configure.

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It is necessary to differentiate between access and relaying rights. While
anonymous access if absolutely OK for a public SMTP server, relaying must be
granted only to the users who need relay rights. Check the virtual server
properties, tab Access, group Relay restrictions, button Relay. Select "Only
the list below" and add the computers by IP address who are authorized to
send emails via your server (relaying). If these settings already look OK
now and "Allow all computers which successfully authenticate to relay,
regardless of the list above" is checked, then your server may have been
hijacked by an SMTP AUTH relay attack (see
http://www.vamsoft.com/orf/authattack.asp). This can be fixed by disabling
the Guest account or by securing your user accounts.

Peter Karsai
http://www.vamsoft.com/orf