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Warning: those guides are mostly obsolete, please have a look at the new documentation.

UnixWindowsOracleObsoleteHardwareDIYMechanicsScriptsConfigs

Setting up Alpine with Maildir and PGP
 
Setting up Alpine with Maildir
Fetch and build Alpine with the Maildir patch,
wget "ftp://ftp.cac.washington.edu/alpine/alpine.tar.gz"
wget "http://patches.freeiz.com/alpine/patches/alpine-2.00/maildir.patch.gz"
#wget "http://patches.freeiz.com/alpine/patches/alpine-2.00/fancy.patch.gz"
gunzip maildir.patch.gz
tar xzf alpine.tar.gz
cd alpine-2.00/
patch -p1 < ../maildir.patch
#patch -p1 < ../fancy.patch
./configure --without-tcl
make
make install
and create a wrapper if you are an old-timer,
cd /usr/local/bin/
ln -s alpine pine
 
Create a default configuration by launching Alpine as the mail user (which has ~/Maildir/) and backup it,
alpine
q
cp .pinerc .pinerc.dist
fix your From field either by using the simple entries,
M S C
Personal Name
User Domain
#personal-name=YOUR NAME
#user-domain=EXAMPLE.NET
or customized headers (needed if your username doesn't match the email address),
vi .pinerc
customized-hdrs=From: YOUR NAME <EMAIL@EXAMPLE.NET>
tweak it as you wish e.g.,
M S C
[ Composer Preferences ] [X] Compose Cancel Confirm Uses Yes
[ Sending Preferences ] [X] Enable 8bit ESMTP Negotiation
[ Folder Preferences ] [X] Single Column Folder List
Pruning Rule =  (*) don't rename, ask about deleting
and if you've also applied the fancy patch, enable reverse thread (no need to change thread-sort-key=),
[ Message Index Preferences ] [X] Enhanced Fancy Thread Support
Sort Key = (*) Reverse tHread
 
Force the use of Maildir folder for all users (as root),
cd /usr/local/lib/
cat > pine.conf <<EOF9
folder-collections=Mail #mc/Maildir/[]
EOF9
Note. Using #mc instead of #md if using a dotted folder structure. Otherwise you would have to add :LAYOUT=fs to your Dovecot mail_location= configuration.
 
Setting up PGP
Install GnuPG (FreeBSD v8),
export PACKAGESITE=ftp://ftp.free.fr/mirrors/ftp.freebsd.org/ports/amd64/packages-8.3-release/Latest/
pkg_add -r gnupg1 (version 1!) 
Note. Using GnuPG version 1 as pinentry does not work with Alpine in text mode (only the GTK pop-up would work).
 
Generate a key pair and export the public one to a file,
cd ~/
gpg --list-keys
gpg --gen-key
gpg --armor --export ID_EIGHT_NUM > USERNAME.2014.asc
gpg --armor --export-secret-keys ID_EIGHT_NUM > /some/safe/place/or/backup/device/USERNAME.2014.private.and.random.text.asc;-)
Note. Eventually chmod 000 or 400 the private key and isolate it on a backup device, for example.
Note. without argument works too, at least for a single managed key pair.
 
Configure Alpine so the display and sending PGP filters become available,
vi .pinerc
display-filters=_LEADING("-----BEGIN PGP SIGNED ")_ /usr/local/libexec/ppf_verify _TMPFILE_,
_LEADING("-----BEGIN PGP MESSAGE")_ /usr/local/libexec/ppf_decrypt _TMPFILE_
sending-filters=/usr/local/libexec/ppf_sign _INCLUDEALLHDRS_,
/usr/local/libexec/ppf_encrypt _INCLUDEALLHDRS_ _RECIPIENTS_
Note. TAB on new lines.
Also add this recommended setting,
feature-list=... + enable-8bit-esmtp-negotiation
Note. TAB on new feature lines.
 
Fetch and install Pine PGP filters,
wget --no-check-certificate "https://dougbarton.us/PGP/ppf/pine-pgp-filters-1.8.tar.gz"
cd pine-pgp-filters-1.8/
./configure
make
make install
Note. It recognizes the GnuPG version at configure time.
 
Ready to go
Note. As the result you should see those changes in your .pinerc,
feature-list=enhanced-fancy-thread-support,
single-column-folder-list,
enable-8bit-esmtp-negotiation,
compose-cancel-confirm-uses-yes
sort-key=tHread/Reverse
Note. TAB on new feature lines.
 
Troubleshooting
If you get this error message while generating PGP keys,
can't connect to the PIN entry module: IPC connect call failed
it is because gnupg2 requires the pinentry package. And you should use GnuPG version 2 unless you are using GTK for the pop-up, as Alpine does not work with pinentry in text mode (pinentry-curses).
 
If you get this error message while sending a signed or encrypted message,
no LC_CTYPE known - assuming UTF-8
make sure you use GnuPG version 1. See explanation above in the guide.
 
If you get this warning,
gpg: WARNING: using insecure memory!
it doesn't really matter.
 
References
Alpine Messaging System: http://www.washington.edu/alpine/
Maildir patch for Alpine: http://patches.freeiz.com/alpine/info/maildir.html
Support for Courier/Cyrus/Dovecot file systems in the Maildir patch for Alpine: http://patches.freeiz.com/alpine/info/courier.html
Pine PGP Filters: https://dougbarton.us/PGP/ppf/
pine-pgp-filters-1.8/README
pine-pgp-filters-1.8/INSTALL
 

(obsolete, see the new doc)