[Dovecot] doveadm purge -A via doveadm-proxy director fails after some users

[Daniel Parthey]

# 2.1.10: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-44-server x86_64 Ubuntu 10.04.4 LTS 

doveadm -c /etc/dovecot-director/dovecot-director.conf -D purge -A
shows the following message in the log when iterating the 49th user:

Oct 17 00:47:17 10.129.3.233 dovecot: doveadm: Error: purge: invalid option -- 'e'
Oct 17 00:47:17 10.129.3.233 dovecot: doveadm(someuser at example-ll.org): Error: doveadm purge: Client sent unknown parameter: ?

Any ideas on how this error gets triggered?

Regards
Daniel
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