If
you are blacklisted you might as well send a letter by the
postal service.
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SPAM:
Blacklists & Whitelists
The permanent Blacklists don't bother with the rolling aspects
of trying to catch spammers as they move from IP to IP--they
just keep adding IPs as they go with the thought process that
the spammer may use the IP in the future, either by exploiting
the same hole or reusing the account again. In the case of
permanent Blacklists they block all e-mail from the IP permanently.
Now, the third group of Blacklists is like the
other two in that when they receive spam from an IP address
they block all
e-mail from that IP however. However, they differ in that rather
than waiting for spam to appear from a new IP address and then
adding it to the Blacklist they take the proactive stance and
say that if 64.191.62.74 sent me spam the other IP addresses
next to it "might" send me spam so they will be blocked
as well. So an obscene Blacklist might block hundreds of IP addresses
next to the spamming IP even though: they might not be sending
spam; they might not be on the same server; and might not even
belong to the same person or company. Their attitude is that
they would rather lose valid e-mail at the expense of receiving
any spam at all because the IP next to it “could” do
something.
So how does this affect you? Remember your domain (hosting account)
uses an IP address. If this IP address is shared by others you
might find your e-mail being refused because someone else sent
spam on the same IP address you are sharing or because a spammer
exploited a security hole and sent spam on the IP address. If
you find your IP address is blocked or Blacklisted then your
e-mail may be refused for a few hours or permanently. Or you
might find that you might have not done anything at all and just
happened to have an IP next to someone who did spam.
So how do you know if are on a Blacklist? There are two ways
to determine this. First, if you receive an e-mail bounced back
after it was refused you can look at the headers of the e-mail.
The headers of an e-mail are all the stuff before the actual
message of the e-mail. Most of the headers will be numbers and
letters but there is a section which can tell you the reason
why your e-mail was not delivered. If you see in there that the
e-mail was refused or blocked then this is a flag that something
is wrong. This does not absolutely mean you are on a Blacklist;
it could also mean that you are not on the Whitelist (discussed
in a bit). At this point you need to look into the matter further
and use the second method.
Continued
Page Three :: SPAM: Blacklists and Whitelists >>
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