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Someone is spamming using my email address

I have a client that is getting an unheard of amount of bounce backs. No of the emails are originating from inside but someone outside is using her email address as the from address in Microsoft Express. How can I stop all of these bounce backs.

Again I confirmed that the email is not being sent from inside my network, but the bounce backs are coming back to her email

is there something on the exchange server or Trend Spam Filter that I can block these?

Luciano Patrão

Hi

This means that your Exchange is an open relay.

So you need to set the Exchange to prevent being used as open relay.

Test you Exchange as open relay:

http://support.microsoft.com/kb/153119/en-us

Since you did not add the Exchange version, check this to fix

http://www.techrepublic.com/article/prevent-open-relays-on-exchange-server/6058582

http://www.petri.co.il/authenticated-or-anonymous-smtp-relay-with-exchange-2007.htm

For understanding the open relay and permissions check this:

http://technet.microsoft.com/en-us/library/aa997170%28EXCHG.140%29.aspx

And also http://www.amset.info/exchange/smtp-openrelay.asp

Hope this can help

Jail

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Amit

Check from what domain that email is coming. Block that domain in Trend Spam Filter.

initialit

ASKER

This is not coming from inside.

Its MS exchange 2003 SP2

The email is coming from random domains on the internet. Pretty much someone emails a bogus address, uses a users from address, then that user gets the bounce back.

Thanks

Luciano Patrão

Hi

Like I said above, check the open relay from your Exchange Server

Jail

Alan Hardisty

The problem you are experiencing is typical spammer behaviour and there is little you can do to prevent this from happening, apart from setting up and SPF record and installing some good Anti-Spam software, such as Vamsoft ORF - www.vamsoft.com ($239 per server).

My article explains a little about SPF and what it can do and also has some other Anti-Spam techniques if you don't want to purchase 3rd party anti-spam software:

https://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_2527-How-to-prevent-Spoofed-Emails-in-Exchange-2003.html

Abdulmalek_Hamsho

The above suggestions work if the sender realy uses your email server to send these messages, but the most common and easier way for the spammer is to use an anonymous email sender which can send in any email behalf, and you cannot do anything in this case except using the Junk Email filters, which can catch such messages.