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### 33.4 Deleting Messages

When you no longer need to keep a message, you can delete it. This flags it as ignorable, and some Rmail commands pretend it is no longer present; but it still has its place in the Rmail file, and still has its message number.

Expunging the Rmail file actually removes the deleted messages. The remaining messages are renumbered consecutively.

`d`

  Delete the current message, and move to the next nondeleted message (`rmail-delete-forward`).

`C-d`

  Delete the current message, and move to the previous nondeleted message (`rmail-delete-backward`).

`u`

  Undelete the current message, or move back to the previous deleted message and undelete it (`rmail-undelete-previous-message`).

`x`

  Expunge the Rmail file (`rmail-expunge`).

There are two Rmail commands for deleting messages. Both delete the current message and select another. `d` (`rmail-delete-forward`) moves to the following message, skipping messages already deleted, while `C-d` (`rmail-delete-backward`) moves to the previous nondeleted message. If there is no nondeleted message to move to in the specified direction, the message that was just deleted remains current. A numeric prefix argument serves as a repeat count, to allow deletion of several messages in a single command. A negative argument reverses the meaning of `d` and `C-d`.

Whenever Rmail deletes a message, it runs the hook `rmail-delete-message-hook`. When the hook functions are invoked, the message has been marked deleted, but it is still the current message in the Rmail buffer.

To make all the deleted messages finally vanish from the Rmail file, type `x` (`rmail-expunge`). Until you do this, you can still undelete the deleted messages. The undeletion command, `u` (`rmail-undelete-previous-message`), is designed to cancel the effect of a `d` command in most cases. It undeletes the current message if the current message is deleted. Otherwise it moves backward to previous messages until a deleted message is found, and undeletes that message. A numeric prefix argument serves as a repeat count, to allow deletion of several messages in a single command.

You can usually undo a `d` with a `u` because the `u` moves back to and undeletes the message that the `d` deleted. But this does not work when the `d` skips a few already-deleted messages that follow the message being deleted; then the `u` command undeletes the last of the messages that were skipped. There is no clean way to avoid this problem. However, by repeating the `u` command, you can eventually get back to the message that you intend to undelete. You can also select a particular deleted message with the `M-p` command, then type `u` to undelete it.

A deleted message has the ‘`deleted`’ attribute, and as a result ‘`deleted`’ appears in the mode line when the current message is deleted. In fact, deleting or undeleting a message is nothing more than adding or removing this attribute. See Rmail Attributes.

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