[Dovecot] POP3 Mails Not Deleted

[imacat]

Dear all,

    Hi.  This is imacat from Taiwan.  We are running Dovecot 1.1.1.  I
received complaints from one of my colleagues.  She checks her mails
both from home and from office, so she left her mails in the server for
3 days.  This morning she got lots of received mails again.  I tracked
the syslog, and found the following records:

============
Jul  2 18:39:59 odin dovecot: POP3(mindyw): Disconnected: Logged out
top=0/0, retr=0/0, del=0/577, size=55354063
Jul  3 11:59:17 odin dovecot: POP3(mindyw): Disconnected: Logged out
top=0/0, retr=99/4866408, del=287/676, size=60218727
Jul  3 12:05:19 odin dovecot: POP3(mindyw): Disconnected: Logged out
top=0/0, retr=288/35132998, del=2/677, size=60220846
Jul  3 12:09:58 odin dovecot: POP3(mindyw): Disconnected: Logged out
top=0/0, retr=2/9289, del=2/675, size=60190368
============

    It seems that the deleted 287 mails was not really deleted, though
the second deletion works.

    This happens occationally, so I cannot easily reproduce it.  Can
anyone look into this issue?  How can I debug further?

    Thank you very much in advance.

-- 
imacat ^_*'
imacat at mail.imacat.idv.tw
PGP Key: http://www.imacat.idv.tw/me/pgpkey.asc

Tavern IMACAT's http://www.imacat.idv.tw/
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