Re: [vps-mail] Dramatic increase of SPAM during last days

[John Lock <jlock@xxxxxxxxxxxxxxxx>]

At 10:59 AM 5/26/2004 -0500, Jerry Gapinski - Acuity Creative wrote:
> What are peoples experiences with false positives using black lists?

I haven't had any false positive complaints so far <fingers crossed>.  But 
since using the blacklists, two important and useful events have happened -

1) Client became aware of their own vulnerability -  I had one client 
running their own mail server that had been hijacked by spammers.  They 
were unaware of the activity until I turned on some DNSBLs.  Then they 
found out the hard way.  Took a while to clean up the mess, but it was a 
valuable lesson and there's one less spambot out there now.

2) Client went after their ISP's for abuse -  After I started using DNSBL's 
one client discovered that his ISP was inadvertently hosting a spammer and 
had been blacklisted.  They complained to the provider, got the account 
cancelled and the block removed.  Again, it took time and patience, but 
there's one less spam source now.

Cheers!

John Lock - VP, Technology
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