From Configuring Alpine:
Start by going to the "Setup
Configuration" screen (M S C) and find
the Folder Preferences section. Under
this section, set
enable-incoming-folders and restart
alpine for the change to take effect.
Now go to your Incoming Message
Folders (F Incoming-Folders), but
don't open your INBOX folder.
Now comes the fun part.
Since you want to add a new folder,
type A. You'll be presented with a
command-line asking for the "Name of
server to contain added folder" and
four options below that. We're
interested in the options. Since
you're going to be pulling mail off of
a remote pop3 server, you want to
configure a mail drop, which is the
last option, thus press Ctrl W. You'll
now be asked for the name of the mail
drop server (the server you're pulling
the mail off of). Enter the server
(and port number if you desire), your
username (which may or may not include
part of the server address), and pop3.
When done, you should have something
that looks like the following:
pop.server.tld:port/user=username@server.tld/pop3
If you are using a secure connection,
you will need to add two things to the
entry. First, append ssl to the end.
When that is done (and assuming you
don't want, or are having difficulties
setting up, certificate validation),
add novalidate-cert just after the
mail drop server. Once you are done,
you should have something that
resembles the following:
pop.server.tld:port/novalidate-cert/user=username@server.tld/pop3/ssl
Now hit Enter. You'll now be asked for
the folder you want to copy the mail
from; answer: Inbox.
Next: "Name of server to contain
destination folder". Leave this blank,
and continue on.
Now for the "Folder to copy mail to".
You can name this anything you want,
but I generally use the user name of
whatever email account I'm setting the
mail drop up for.
And I do the same as above for the
"Nickname for folder "username"".
And now you have a brand new mail drop
folder. To set up more, just repeat as
needed.
Alpine e-mail setup also has Alpine setup instructions, including how to set up Gmail using POP3 (including pictures):
This is an example of using POP3 from
Gmail. You will need to enable POP3
from your Gmail account under
Settings→Forwarding and POP/IMAP.
To create a new incoming folder for
POP, use Main Menu→Folder
List→Incoming-Folders→Add.
It will prompt to ask you the Name of
server to contain added folder:
Name of server to contain added folder: pop.gmail.com:995/novalidate-cert/user=username@gmail.com/pop3/ssl
It will then prompt to ask for the
'Folder on 'pop.gmail.com…" to add:
Folder on "pop.gmail.com.." to add:
INBOX
Fill in a nickname:
Nickname for folder "INBOX" : INBOX at
gmail.com
It will then connect to
gmail server and will prompt for the
username@gmail.com password. Enter it,
and the INBOX will open.