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Chapter 8. Mail Client: Mozilla
8.4. Folders and Filters
You can sort mail in different folders according to specified criteria (sender, subject, date, etc.) using filters in
order to organize incoming e-mail. Filters are very powerful, but in this guide we’ll only be able to look at
some simple filter rules. Feel free to explore the filters tool (Tools→Message Filters...).
Let’s assume you want to filter incoming messages according to the sender and you have at least one message
from that sender in your Inbox folder. You want all incoming e-mail from [email protected] to go
directly into the SomeUser folder.
Highlight the message from the sender you want to filter and select Message→Create Filter From Message....
The filter creation window (figure 8-9) will appear.
Figure 8-9. The Filter Creation Window
If the SomeUser folder does not exist, click the New Folder... button. In the Name field, enter the name of the
new folder (SomeUser in our example). The Create as a sub-folder of pull-down list specifies the parent folder
for the one you’re about to create. Select the desired parent folder by navigating the folder tree and selecting
Choose this for the parent. Click OK to create the new folder.
And that’s all. You can change the Filter name if you want to (by default the filter’s name is sender’s mail
address). Use the More and Fewer buttons to add and remove filtering criteria to the rule and, once you are
satisfied with your settings, click the OK button to accept the rule. You can create as many filtering rules as
you want. By moving rules up and down in the Message Filters list, you can actually create a very complex
and efficient set of filtering rules.
8.5. Digital Signing and Encrypting Mail Messages
Digitally signing a message helps ensure it has not been tampered with (providing integrity) while encrypting
a message helps ensure that nobody, except the intended recipient(s), will be able to “see” the message while
in transit on the network (provides confidentiality).
In order to use digital signatures or encryption for your mail messages, a personal certificate is needed. Such a
certificate can be obtained from a trusted certificate authority or you can generate it yourself (generally good
enough for “personal” use) by means of OpenPGP . Please see gpg(1) for key generation information.
GPG keys can also be generated within Mozilla by choosing Enigmail+Generate Key from the menu. Fill in the Passphrase and
Passphrase (repeat) fields with a secret passphrase, the Comment
field with any string to identify you, and click on the Generate Key
button.
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