non mi risultano limiti in tal senso.... prova ha ottimizzare gli header imap sul database con questa procedura come da Help admin:
To run the mail conversion utility to add or update IMAP attributes.
1. Shut down the Router on the server containing the mail files to convert, by entering the following command at the console:
tell router quit
This prevents IBM® Lotus® Domino™ from routing mail to the mail files while they are being converted. Mail is stored in MAIL.BOX while you upgrade the mail files. After you have converted the mail files and loaded the Router task again, the Router processes and delivers the mail in MAIL.BOX.
2. Load the mail conversion utility by entering the following command:
load convert [-h /-o] maildirectory\mailfilename
where maildirectory names the path to the mail subdirectory that contains the user\'s mail file and mailfilename is the filename of the user\'s mail file. The maildirectory path describes the path relative to the server\'s Domino data directory. For example, to add IMAP attributes to the mail database USER.NSF in the \MAIL subdirectory of the Domino data directory, enter:
load convert -h mail\user.nsf
Note On UNIX® systems, use a forward slash (/) as the hierarchy separator, rather than a backslash (\). For example, enter:
load convert -h mail/user.nsf
To specify all files in a directory, make sure the directory only contains mail files and that they are the mail files you want to convert. For example, to add IMAP attributes to all mail files in the \MAIL subdirectory, enter:
load convert -h mail\*.nsf
Caution When the conversion utility is run with the -h option, the conversion operation can take a long time to complete. The exact time depends on server processing speed and memory, as well as on the size and composition of the mail file. To ensure that you can complete conversions in the available time, run a test with a single mail file before using a wildcard to run multiple conversions.
3. After you finish enabling mail files for IMAP on this server, load the Router by entering:
load router
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