What type of connection are you on. Do you get a public IP via DHCP? Do you have a mail server. You can check the logs if Logging is enabled. Alternatively, scan computers for viruses. Your gateway is also a good place to sniff for unusual smtp traffic.<br>
<br><div class="gmail_quote">On Fri, Jan 28, 2011 at 1:33 PM, Simon Mbuthia <span dir="ltr">&lt;<a href="mailto:simon.mbuthia@gmail.com">simon.mbuthia@gmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
1. Check that your mail server is not an open relay<div>2. Monitor connections to your server&#39;s port 25 from within the network. Try wireshark for SMTP traffic<div><div></div><div class="h5"><br><br><div class="gmail_quote">
On 28 January 2011 13:31, boniface njoroge <span dir="ltr">&lt;<a href="mailto:bonifacenjoroge5@gmail.com" target="_blank">bonifacenjoroge5@gmail.com</a>&gt;</span> wrote:<br>

<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi guys our domain was recently blacklisted,the case was that  alot of<br>
spam was coming from our side.Is there a way to know the specific user<br>
that is sending the spam from my networkWe have a corporate anti virus<br>
in this case NOD 32 .Thank you<br>
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