An RBL is a Realtime Blackhole List, also known as a block list or
black list, containing IP addresses of spammers, suspected spammers,
netblocks belonging to ISPs deemed friendly to spammers, lists of
IPs assigned to dial up accounts, and servers allowing an open
relay. There are more than 150 RBLs available and they vary in how
successful they are at blocking unwanted email. The less restrictive
ones will be less effective, possibly to the point that it's not
worth using while the most restrictive ones can hamper your ability
to receive email from your customers.
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Realtime Blackhole Lists are essentially lists of IP addresses and
subnets of spam senders. Servers can query these lists to determine
of the originating IP address of a message is flagged by the list.
Much has been written about a number of these lists and the people
who manage them. Some lists and their maintainers are seen as overly
aggressive in their classification of spam or in their inclusion of
broad blocks of IP addresses (sometimes entire countries or
continents are listed).
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People often ask me how they can search Outlook for folder names
because they created so many folders, often nested so deeply, that
they can't easily find folders when they need them. Unfortunately,
Outlook doesn't support a way to search for folders, so it's
important to use a good filing method, such as the one Keith Collyer
uses:
"I gave up on complex folder structures and simply have a set of A-Z
folders, with the folders containing messages under these. Now I
don't have to worry about whether I put something under "Customers"
or "Projects", I just need to remember the name of the customer.
Unless I get a huge number of messages for a customer on very
different topics, I just put all the stuff in one folder. So "Big
Company" goes under "B / Big Company", unless I get a very different
topic to work on for them, when I add "B / Big Company - Topic", at
the same level as the original "B / Big Company" rather than nested.
It sounds too simple to work, but it is much easier to use and find
stuff than any structure I had before. Of course, my Windows file
system has the same structure."
Use Exchange Server 2003's new tarpittime registry key to prevent
the enumeration of Exchange Server 2003 e-mail addresses.
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