The Lotus Domino server provides an IMAP task which does more or less what it is supposed to do: serve incoming messages to IMAP clients via the IMAP protocol. IMAP is enabled on the Domino user's mail file with a load convert -m mail/username.nsf performed from the administration console.

We have started migrating a small number of users from Lotus Domino to a new open source based mail server and I wanted them to at least be able to take some of their mail along. This is easily done with fetchmail, a mail retrieval and forwarding utility which can read just about anything from anywhere and dump it wherever ;-)

Since we are using a Maildir-based Dovecot, I simply create a new directory under the user's Maildir (e.g. ~/Maildir/Lotus), populate that with a correct maildir format (three directories new, cur and tmp need to be created), change to ~/Maildir/Lotus/cur and get fetchmail to retrieve mail from the user's Inbox:

fetchmail --keep \
        --all  \
        --ssl \
        -P 993 \
        --mda /bin/migrate-mda \
       -u username \
       --protocol imap \

Here I'm telling fetchmail to use the given script as a Mail Delivery Agent. The script simply creates a unique name in that directory and reads whatever fetchmail gave it to stdin, copying that into the file:

    cat > "lotus.`date +%N`.$$"

The filenames generated look like lotus.671129000.740, the second part been the nano second and the last part the process-id of the mda script.

This will grab all messages (--all) from the user's Inbox, leaving it on the Domino server (--keep). If you want to get messages from one or more real folders (not views!) in your Notes mail file, add the --folder=Name to the fetchmail invocation (RTFM).

Do ensure that all files and directories in the newly created subfolder of the user's maildir have the correct permissions and ownership.

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Mail and DomiNotes :: 14 Jan 2006 :: e-mail


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