UW IMAP

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Although UW IMAP has not been actively developed in many years, it still works well as a basic IMAPS server. (For other IMAP servers, see Mail server#POP3/IMAP servers.)

Installation

Install imap. It does not use a configuration file.

Setup

Although it was originally designed to be used with inetd, on modern Arch systems a better solution is to use a systemd socket file:

/etc/systemd/system/imaps.socket
[Unit]
Description=IMAP Server Activation Socket
Documentation=https://www.washington.edu/imap/

[Socket]
ListenStream=0.0.0.0:993
Accept=true

[Install]
WantedBy=sockets.target

Also, a corresponding .service file needs to be created:

/etc/systemd/system/imaps@.service
[Unit]
Description=IMAP Server

[Service]
ExecStart=-/usr/bin/imapd
StandardInput=socket

UW-IMAPD uses PAM, so a PAM authorization file will also need to be created. This example will provide authentication using standard system passwords:

/etc/pam.d/imap
auth		required	pam_unix.so
account		required	pam_unix.so
session		required	pam_unix.so

Enable and start imaps.socket and test.

SSL

A generic SSL certificate and key will be created at /etc/ssl/certs/imapd.pem if it doesn't yet exist. This can (and should) be replaced with a signed certificate for the specific server.