[Dovecot] Test migration (IMAP copy) and INTERNALDATE?

[Apps Lists]

We're trying some migration tests ... from CommuniGate to Dovecot.  The
migration program does an APPEND into the new mailbox:

src>: a0 FETCH 2900 (FLAGS INTERNALDATE RFC822.PEEK)
src<: * 2900 FETCH (FLAGS (\Seen) INTERNALDATE "29-Aug-2005 18:36:54
+0000" RFC822 {1194157}
src<: )
dst>: bAPP APPEND "INBOX" (\Seen) "29-Aug-2005 18:36:54 +0000" {1194157}
dst<: + OK

It appears to be trying to set the message date... in this example, to 29
Aug 2005.

Dovecot seems to be ignoring it.

Am I doing something wrong, or does Dovecot not allow this?

Steve