Improve bulk selection and filtering of messages for deletion
Trying to cleanup a large, > 100K message mbox is very user unfriendly. I can only search and select 50 messages at a time, cannot select messages that are not directly addressed to me (ie. sent bcc or to a listserv), in the manage storage dialog, i cannot filter messages that have attachments, have to select them 1 at a time. All around, the feature set for managing a large mbox is very limited.
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