Currently when the mail quota of the user is exceeded then user cannot sent any mail. This severely restricts user's ability to sent the mails when the user is travelling. Since these mails cannot be saved to mail file, so such mails are lost as there is no option to save them later. So user has to sent the important mails without saving to mail file which is not good.
To overcome this situation, please provide a feature which will store mails on server which are sent by the user when the quota is exceeded. After that once the quota comes within limit, server can simply push those mails to user's mail file in Sent items. So this way, users will not lose the important mails.
This Enhancement Request is submitted for Domino V12.