Extract e-mail attachments

Problem

You have a file that contains not only the e-mail text but the attachments too in encoded form. How to extract those attachments easily?

Solution

One way is to use mpack:

$ sudo apt-get install mpack
$ munpack email.eml

Or, you can also use uudeview:

$ sudo apt-get install uudeview
$ uudeview email.eml