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Anti-Spam Mechanisms on our Mail Servers Unsolicited Bulk Email ("spam", "junk email") is a major problem on the Internet. As with many Service Providers, 80%+ of incoming email at Ultradesign's mail relays is spam. If not dealt with efficiently by rejecting it before it enters our servers and customer mailboxes, the ever-increasing volume of junk email would clog our mail queues and seriously annoy our customers. To address this problem, Ultradesign Internet uses a series of anti-spam mechanisms/filters on our mail relays which very efficiently identify and reject over 99% of incoming spam emails. |
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The spam filters outlined below apply to all incoming email for all domains by default. Ultradesign customers can request anti-spam filters be turned OFF for their domain by contacting Support. |
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DNS-based Block Lists (DNSBLs) Ultradesign Internet (UXN) uses the following International Blocklists to refuse incoming email from known spam sources and identified spam relayers. Our mail servers check all connecting server 's IP address against these trusted blocklists:
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Anti-Spam Mechanisms Our server anti-spam mechanisms include:
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DNS (Reverse) Name Blacklist Connections are rejected from IPs whose reverse lookup matches the following heavily-abused DNS names, denoting dynamic dialups or machines which should not be running mail services:
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Content Filters Our server content filter refuses messages containing certain text strings normally found only in spam. The primary tests include:
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Local IP Blacklist In addition to the DNSBLs and filters above, the following are netblocks blacklisted locally, as at April 2004:
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