2 <HEAD><TITLE>Alpine Technical Notes
</TITLE></HEAD>
4 <H1>Alpine Technical Notes
</H1>
6 Version
2.26, June
2022
8 <H2><A NAME=
"TOC">Table of Contents
</A></H2><P>
10 <H3><A HREF=
"introduction.html">Introduction
</A></H3>
13 <LI><A HREF=
"introduction.html#design">Design Goals
</A><BR>
14 <LI><A HREF=
"introduction.html#components">Alpine Components
</A><BR>
17 <H3><A HREF=
"background.html">Background Details
</A></H3>
20 <LI><A HREF=
"background.html#DNS">Domain Names
</A><BR>
21 <LI><A HREF=
"background.html#rfc2822">RFC
2822 Compliance
</A><BR>
22 <LI><A HREF=
"background.html#SMTP">SMTP and Sendmail
</A><BR>
23 <LI><A HREF=
"background.html#IMAP">Internet Message Access Protocol (IMAP)
</A><BR>
24 <LI><A HREF=
"background.html#MIME">Multipurpose Internet Mail Extensions (MIME)
</A><BR>
25 <LI><A HREF=
"background.html#collections">Folder Collections
</A><BR>
28 <H3><A HREF=
"installation.html">Building and Installation
</A></H3>
31 <LI><A HREF=
"installation.html#compile">Compile-time Options
</A><BR>
32 <LI><A HREF=
"installation.html#ldap-compile">Including LDAP Functionality
</A><BR>
33 <LI><A HREF=
"installation.html#krb5-compile">Including Kerberos
5 Functionality
</A><BR>
34 <LI><A HREF=
"installation.html#pine-compile">Other Alpine Compile-time Options
</A><BR>
35 <LI><A HREF=
"installation.html#imapd-compile">IMAPd Compile-time Options
</A><BR>
36 <LI><A HREF=
"installation.html#build">Building the Alpine Programs
</A><BR>
37 <LI><A HREF=
"installation.html#install-unix">Installing Alpine and Pico on UNIX Platforms
</A><BR>
38 <LI><A HREF=
"installation.html#install-pc">Installing PC-Alpine
</A><BR>
39 <LI><A HREF=
"installation.html#install-imapd">Installing IMAPd
</A><BR>
40 <LI><A HREF=
"installation.html#files-unix">Support Files and Environment Variables: UNIX Alpine
</A><BR>
41 <LI><A HREF=
"installation.html#files-pc">Support Files, Environment Variables, and Registry Values: PC-Alpine
</A><BR>
44 <H3><A HREF=
"cmd-line.html">Command Line Arguments
</A></H3>
47 <LI><A HREF=
"cmd-line.html#alpine">Alpine
</A><BR>
48 <LI><A HREF=
"cmd-line.html#pico">Pico
</A><BR>
49 <LI><A HREF=
"cmd-line.html#pilot">Pilot
</A><BR>
52 <H3><A HREF=
"config.html">Configuration and Preferences
</A></H3>
55 <LI><A HREF=
"config.html#pine-conf">Alpine Configuration
</A><BR>
56 <LI><A HREF=
"config.html#gen-conf">General Configuration Variables
</A><BR>
57 <LI><A HREF=
"config.html#features-conf">Configuration Features
</A><BR>
58 <LI><A HREF=
"config.html#hidden-config">Hidden Config Variables and Features
</A><BR>
59 <LI><A HREF=
"config.html#ret-var">Retired Variables
</A><BR>
60 <LI><A HREF=
"config.html#index-tokens">Tokens for Index and Replying
</A><BR>
61 <LI><A HREF=
"config.html#reply-token-conditionals">Conditional Inclusion of Text for Reply-Leadin, Signatures, and Templates
</A><BR>
62 <LI><A HREF=
"config.html#per-server-ldap-config">Per Server Directory Configuration
</A><BR>
63 <LI><A HREF=
"config.html#color-config">Color Configuration
</A><BR>
64 <LI><A HREF=
"config.html#index-color-config">Index Line Color Configuration
</A><BR>
65 <LI><A HREF=
"config.html#role-config">Role Configuration
</A><BR>
66 <LI><A HREF=
"config.html#filter-config">Filtering Configuration
</A><BR>
67 <LI><A HREF=
"config.html#scoring-config">Scoring Configuration
</A><BR>
68 <LI><A HREF=
"config.html#other-config">Other Rules Configuration
</A><BR>
69 <LI><A HREF=
"config.html#search-rules-config">Search Rules Configuration
</A><BR>
70 <LI><A HREF=
"config.html#patterns-section">Patterns
</A><BR>
71 <LI><A HREF=
"config.html#configuring-news">Configuring News
</A><BR>
73 <H4><A HREF=
"config-notes.html">Configuration Notes
</A></H4>
76 <LI><A HREF=
"config-notes.html#fkey">Alpine in Function Key Mode
</A><BR>
77 <LI><A HREF=
"config-notes.html#domain">Domain Settings
</A><BR>
78 <LI><A HREF=
"config-notes.html#collections">Syntax for Collections
</A><BR>
79 <LI><A HREF=
"config-notes.html#remote-folders">Syntax for Folder Names
</A><BR>
80 <LI><A HREF=
"config-notes.html#server-name-syntax">Server Name Syntax
</A><BR>
81 <LI><A HREF=
"config-notes.html#folder-namespaces">Folder Namespaces
</A><BR>
82 <LI><A HREF=
"config-notes.html#maildrop">What is a Mail Drop?
</A><BR>
83 <LI><A HREF=
"config-notes.html#sorting">Sorting a Folder
</A><BR>
84 <LI><A HREF=
"config-notes.html#alt-ed">Alternate Editor
</A><BR>
85 <LI><A HREF=
"config-notes.html#signature">Signatures and Signature Placement
</A><BR>
86 <LI><A HREF=
"config-notes.html#feature-list">Feature List Variable
</A><BR>
87 <LI><A HREF=
"config-notes.html#config-inheritance">Configuration Inheritance
</A><BR>
88 <LI><A HREF=
"config-notes.html#env-variables">Using Environment Variables
</A><BR>
89 <LI><A HREF=
"config-notes.html#smtp-server">SMTP Servers
</A><BR>
90 <LI><A HREF=
"config-notes.html#mime.types">MIME.Types file
</A><BR>
91 <LI><A HREF=
"config-notes.html#color-config-notes">Color Details
</A><BR>
92 <LI><A HREF=
"config-notes.html#smime-general">S/MIME Overview
</A><BR>
93 <LI><A HREF=
"config-notes.html#pc-notes">Additional Notes on PC-Alpine
</A><BR>
98 <H3><A HREF=
"low-level.html">Behind the Scenes
</A></H3>
101 <LI><A HREF=
"low-level.html#addrbook">Address Books
</A><BR>
102 <LI><A HREF=
"low-level.html#remote-config">Remote Configuration
</A><BR>
103 <LI><A HREF=
"low-level.html#checkpoint">Checkpointing
</A><BR>
104 <LI><A HREF=
"low-level.html#debug">Debug Files
</A><BR>
105 <LI><A HREF=
"low-level.html#INBOX">INBOX and Special Folders
</A><BR>
106 <LI><A HREF=
"low-level.html#help">Internal Help Files
</A><BR>
107 <LI><A HREF=
"low-level.html#char-set">International Character Sets
</A><BR>
108 <LI><A HREF=
"low-level.html#interrupt">Interrupted and Postponed Messages
</A><BR>
109 <LI><A HREF=
"low-level.html#status">Message Status
</A><BR>
110 <LI><A HREF=
"low-level.html#MIME-read">MIME: Reading a Message
</A><BR>
111 <LI><A HREF=
"low-level.html#MIME-send">MIME: Sending a Message
</A><BR>
112 <LI><A HREF=
"low-level.html#new-mail">New Mail Notification
</A><BR>
113 <LI><A HREF=
"low-level.html#NFS">NFS
</A><BR>
114 <LI><A HREF=
"low-level.html#print">Printers and Printing
</A><BR>
115 <LI><A HREF=
"low-level.html#save">Save and Export
</A><BR>
116 <LI><A HREF=
"low-level.html#sent-mail">Sent Mail
</A><BR>
117 <LI><A HREF=
"low-level.html#spell">Spell Checker
</A><BR>
118 <LI><A HREF=
"low-level.html#terminal">Terminal Emulation and Key Mapping
</A><BR>