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Every single Internet email message has:
1. An
origin (the machine that sent it)
2. Relay
(the machine for relaying it to another machine)
3. Final
destination (the machine that receive it)
4.
IP address
5.
Domain name
1. Origin,
is the machine used
to send the email message, even if it is a stand alone desktop
PCs mail server -- See: 4.
IP address
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2.
Relay,
all email messages must be relayed
to get to its final destination (the mail server or almost every computer
connected to the Internet can act as a relay). And email programs have a
setting for "relay host" or SMTP that
allows a computer to acts as a relay. |
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3. Destination,
is the recipient of your message.
Every email message contains a
body--the
actual message and a header--visible,
only if the recipient chooses to view it. |
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Message
headers
contain all of the information about the route that
takes place when the email travels from
the
origin to the
Relay
to the destination, including the origin of the country that
that particular IP address block of that country that if
belongs to. Notes: Usually entire block of IP addresses are
assigned to each different county.
4.
IP address,
every computer connected to the Internet
is represented by an
IP
address and a domain name.
An IP address is a numeric code (ie. 205.199.212.30)
that uniquely identifies a computer on the Internet which can be traced to
the owner of that particular machine being used to dial-up, ISDN, cable,
DSL, ADSL, etc. to access the Internet as well as the country that it came
from.
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5.
Domain name,
is a name that
corresponds
with an IP address and can be
easily traced to the real owner using
nslookup--a DNS whois tool that perform forward/reverse DNS queries for
a
domain address and getting an IP address of a hostname and hostname of the IP
address. Summary
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Every email
message
header contains the
IP address and domain
of the computer from where the message
originated, the
IP address and domain
of the
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computer that
relay
the message, and the
IP address and domain
of the final destination.
The information
in an email header
is used by many anti-spam filters to
blacklist
an email domain or the entire block of it, in combination with specific text, sentence
string in the message, subject line, etc.
Visit http://www.spamhaus.org
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As spam filters
gets more and more effective by using a cocktail of methods from;
blacklisting, content or behavioral analysis--such as large numbers of blind
copies (BCC), address validation
nslookup--for
senders trying to cloak their identity to heuristics and digital algorithms
identifying common spam patterns and scanning for pornography graphics skin
tones... |
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