Therefore, I wanted to do some kind of "IMAP list" of the account, with a command line tool:

• specify username, pass and server,
• the tool would return a list of all email in their folders (message ID, From, To, Date, Subject).

I would run it i.e. daily and this would let me verify when the mail was really visible in the account.

Is anyone aware of a tool I could use to achieve that?

Not offhand, but if you want a remote tool, it ought to be simple to cobble together some feeder script and netcat (or openssl s_client). It will also be simpler if you configure the master password feature so you don't have access to all user passwords.

So something like this for dumping the INBOX contents

#!/bin/sh

master-user=masteru
master-password=masterp

while read user server; do
netcat --ssl $server 993 <<_EOF_ >${user}.report
1 LOGIN ${user}*${master-user} ${master-password)
2 SELECT INBOX
3 ...
4 LOGOUT
_EOF_
done

I don't know enough IMAP to fill in "3 ..." to dump all headers, but I'm sure it's not hard to find out.

It's even simpler if you don't need to do it remotely: just use

doveadm fetch -A hdr MAILBOX '*'

Joseph Tam <jtam.home@gmail.com>