newbie: Mailman sends a digest over and over again...

Dear gurus,
I'm running Mailman 1.0rc3 on a RedHat 5.2 box. I have a problem...
A couple of days ago I started up a new list. For some strange reason one of my digest subscribers keeps getting digest #1 over and over again once every hour. I have tried to unsub him, but the mail keeps going out. The logfiles for Mailman looks just fine. Everything else works perfect, but how do I stop this mail from going out??
I'm not a unix guru, so please give some advice here...I did delete the digest in /var/spool/mqueue/, restarted sendmail, cron etc...I also did a complete reboot.
TIA,
/David
This is an output from the maillog:
Sep 1 12:27:37 www sendmail[589]: TAA12159: to=<andersson@erbe-med.de>, delay=4+17:27:35, xdelay=00:00:37, mailer=esmtp, relay=hq.seicom.net. [194.97.200.30], stat=Sent (LAA59502 Message accepted for delivery)
Sep 1 13:27:34 www sendmail[671]: TAA12159: to=<andersson@erbe-med.de>, delay=4+18:27:32, xdelay=00:00:34, mailer=esmtp, relay=hq.seicom.net. [194.97.200.30], stat=Sent (MAA65482 Message accepted for delivery)
participants (1)
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David