You can convert the existing database (or, at least the message block table) to innodb format, which will allow it to expand beyond 4gb.
Information on doing this is in the MySQL documentation (barely!), but there is a more extensive how-to on the MySQL web site. Well, actually, it's on the innodb web site, but there are links to it on the MySQL site. SP> We use DBmail with Postfix for multiples domains and virtuals SP> users in IMAP on Debian 2.4 kernel. The mail base is about 35000 SP> messages and the messageblks table is more than 4Gb and MySQL say SP> that it can't insert more records because the table is full. SP> How to rise the table size limit, we plan to store more than SP> 100,000 messages. -- Best regards, Jeff mailto:[EMAIL PROTECTED]