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Open Single-level Relay Server Block List

servers which are open relay mail servers. which are being abused, are listed here.

Consists of collections of domain named hosts or IP address networks, which are being abused by spammers, due to them running an insecure (open) mail server.

Generally, the software which allows this is an out of date, or old, or incorrectly configured mail server package.

Microsoft Exchange, mDaemon, sendmail, and many others, have been abused, over the years.

Spammers use these open proxies to hide their identity, and then usually abuse another open relay server, to further confuse and hide their identities.

The use of open proxies and open relays can entirely hide the identity and origin of spammers, so they are a very bad thing indeed.

The hosts which have been tested by dnsbl.net.au to be open relay, _and_ are currently being abused to relay spam, are placed on this list.

We do not scan, or look for these open relays.

We do not test often, just whenever a 'new' host attempts to inject email into our network/s.

See this page for more details on our testing.
dnsbl.net.au abuse [at] dnsbl [dot] net [dot] au