Setting up a local imap server
To install a local imap daemon that will only listen to localhost connections, made via ssh tunneling. This is for use as a local backup of your imap files, or for keeping a remote backup somewhere.
This is not a mail delivery solution but rather a way to keep a backup of your email using to a
MailDir directory that you can access using your email client. As each message is stored in its own file, you can also use normal tools like
find|sed|awk|grep to find messages.
This setup can be installed locally or remotely on, for example, a raspberry pi. In that case you can enable a portforwarding rule in
~/.ssh/config to include something like
LocalForward 127.0.0.1:2143 127.0.0.1:143
aptitude install courier-imap courier-authdaemon
You can check the status using
systemctl status courier-imap.service courier-authdaemon.service
Edit the file
/etc/courier/imapd and modify the following settings:
Address to listen on, can be set to a single IP address.
Maximum number of IMAP servers started
Maximum number of connections to accept from the same IP address
The following setting is optional, and causes messages from the given folder to be automatically deleted after the given number of days.
Change the directory name of the maildir directory.
Then restart the service using
systemctl restart courier-imap.service courier-authdaemon.service.
When I did this I got a strange error about but installing the package
gamin fixed it. Which is a Library providing the FAM File Alteration Monitor API.
Filesystem notification initialization error -- contact your mail
administrator (check for configuration errors with the FAM/Gamin library)