Trash Plugin (trash)

Normally, a quota exceeded error is returned if saving/copying a message would bring the user over quota. With the trash plugin, the oldest messages are instead expunged from the specified mailboxes until the message can be saved.

If the new message is large enough that it wouldn't fit even if all messages from configured mailboxes were expunged, then no messages are expunged and the user receives a "Quota exceeded" error.

Settings

trash_priority

Default	[None]
Value	unsigned integer

If non-zero, enables the trash plugin for the mailbox with the specified priority. Mailboxes with smaller priority number are emptied before mailboxes with a larger priority number. If there are multiple mailboxes with the same priority, expunge the oldest mail from them first.

Example where Trash is emptied before Spam:

namespace inbox {
  mailbox Trash {
    trash_priority = 1
  }
  mailbox Spam {
    trash_priority = 2
  }
}

Configuration

Requires quota plugin to be loaded and configured to use non-FS quota.

Example:

dovecot.conf

mail_plugins {
  quota = yes
  trash = yes
}

namespace inbox {
  # Spam mailbox is emptied before Trash
  mailbox Spam {
    priority = 1
  }

  # Trash mailbox is emptied before Sent
  mailbox Trash {
    priority = 2
  }

  # If both Sent and "Sent Messages" mailboxes exist, the next oldest message
  # to be deleted is looked up from both of the mailboxes.
  mailbox Sent {
    priority = 3
  }
  mailbox "Sent Messages" {
    priority = 3
  }