Then you can watch for these kinds of connections in your firewall logs and maybe you'll track it down, but don't count on it.Īdditional steps to take once you've stopped the problem leaking to the internet are configuring the individual workstation firewalls to disallow SMTP and allow DNS only to the DNS servers. In which case you can configure your firewall first thing and hopefully the offending machine won't be booted before you have (maybe you can do it remotely this evening).
Assuming your servers are still on and you haven't cut the internet connection). It's now 9 ish so that means the last activity was seen around 4. I guess its more likely that one of your workstations is producing the traffic (the CBL is showing that the activity was last seen 5 hours ago. Obviously, if any of these machines are then you need to deal with it. If none of these machines are producing the offending traffic then the time the activity was last seen will drift away into the past and you can use their delisting procedure. I can only assume that one of the exchange accounts is receiving alot of spam, or sending spam.Ĭonfigure your firewall to accept SMTP and DNS outbound connections only from your Exchange server and DNS servers. #550 5.7.1 Service unavailable Client host blocked using Spamhaus To request removal from this list see At the minute it appears to have only been restricted to microsoft emails (hotmail), but i do not want to go through the head ache of changing ip address again. It may have been rejected by a moderator, the address may only accept e-mail from certain senders, or another restriction may be preventing delivery.ĭiagnostic information for administrators:ĭB3FFO11FD060. Your message wasn't delivered due to a permission or security issue. Service unavailable Client host blocked using Spamhaus To request removal from this list see Blocklist Removal Center - The Spamhaus Project rejected your message to the following e-mail addresses:ĭB3FFO11FD060. We assumed that they gave us an IP that had been previously used by some kind of spamware company, hence the reason for it being blocked.Ī quick phone call and new IP later we have been fine for 4 months.ĭB3FFO11FD060. They gave us a new ip and the problems began. Originally we changed our web provider to exanetworks from BT. Our exchange email server has had its IP address blocked for the second time by anti spamware companies.
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