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Created and maintained by
Jacek Olszewski
Menu software by
PHP Layers Menu System
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Personal Email Filter for
Operation
From the point of view of individual users personal filter is rather drastic,
but most effective solution to the spam problem.
It uses two address lists, white and black. When a message comes from an
address found:
- on the white list, it is delivered to your mail box,
- on the black list, it is removed immediately, without even
notifying its sender,
- on neither of the lists, it is removed immediately, but the sender gets a
reply telling him/her how to put his/her address easily on your white list.
When a message comes from an unknown person who wants
to inform/ask you about something, he/she gets an automatic reply from you,
that tells him/her to send an empty message to a special address. Reception of
any message at the special address results automatically in addition of the
message sender's address to your white list. Then, any subsequent messages
from that address are accepted and delivered to your mail box.
Both, the special address and the automatic reply text (response to unknown
senders), are to be formed
on page Code and Response (link on the top or bottom line).
If, however, a message comes from some spam generating software rather
than from a live person, its sender's address is most likely faked -
non-existent, or one of free email services, eg. hotmail, bigfoot, yahoo,
valid only for a short time, with its mail box usually overfilled
(not accepting any replies). It means your automatic reply to spam senders
will not be read by anybody, to say nothing about following the advice it
contains. Therefore, no spam sender's address has any practical chance of
getting onto your white list. Such addresses will remain unknown, and messages
coming from them will not pollute your mail box.
It may happen that spam comes as though from your address - a clever
spamming software substitutes your address for its own. To block such spam,
put your address on the black list. If, for any reason, you would like
to send yourself a message, remove your address from the black list
before sending the message, and put it back on the list afterwards.
Addresses that should be on the white list
MAILER-DAEMON is a special address from which various error
notifications (unknown recipient, unknown domain, delivery problems, etc.) may
come. There is no need, however, to put it on the white list. Personal Email
Filter deals with messages from MAILER-DAEMON according to the
following rule. If they concern problems with delivery of the response to
unknown senders, they are discarded - there is no point in worrying about
the response not being delivered to non-existent or faked addresses. Otherwise,
they are accepted.
On page White and black lists (link on the top or bottom line) you will see
both of your lists initially empty. You should add to the list
addresses of those whose messages are welcome. If you have an address book in
your mailing software, you can easily transfer its content to the white list
(see instructions on the White and black lists page - upload). Also, make sure
addresses of all mailing list you have subscribed to are included. Otherwise you would not
get any messages sent to the list. Moreover, each message coming from the list
would make your 'Response to unknown senders' go to the message author, if not
to the whole list. That surely would not be received too kindly by the author
or other subscribers.
There are mailing lists organized in such a way that the sender's address is
that of the message author. You do not, however, have to put
addresses of all subscribers on your white list. In the message header
you can find a line beginning with Reply-To: or Return-Path: or Sender: or List-Post:. It contains
the address you should put on your white list to accept messages from any
subscriber. Depending on your mailing software such lines may be found
in the normal or full header of the message. If you need advice how to retrieve the full header,
click here.
The use of Personal Email Filter requires you to develop a certain habit -
before sending a message to an address which is not on your white list, put
the address on the list. Otherwise, a possible reply from that address would be rejected, and the
addressee would get your automatic 'Response to unknown senders', undoubtedly
to his/her surprise.
Start and stop of filtering
At the top and bottom of White and black lists page you will find
an indicator of whether filtering is enabled or disabled, and a link to
toggle it. Initially, it is disabled. Changes to your code, response, white
and black lists may be made any time irrespective of whether filtering is
enabled or disabled. If it is enabled, their effect is immediate.
Personal Email Filter software by
AntSpa. Installed and maintained by
Bruce O'Lala.
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