Hi Steven,

It's quite simple in Mail. Every incoming and outgoing message is
stored in its own individual file on disk. (There are heaps of
advantages to doing it this way.) It stays there until you delete it.
When you delete it, it's gone and the disk space is immediately
reclaimed. There is no need to delete attachments unless you
personally like to do so.

Now, all internet e-mail works in a way that means all "attachments"
are actually part of the messages themselves (not really attachments
at all!). So, when Mail stores an e-mail in a file, the file
implicitly contains all the attachments too. When you the delete a
message in Apple Mail, the file is deleted, and hence the message and
all "attachments" are gone. You recover the disk space immediately.

Now to solve your problem. To delete attachments from within a message
*without* deleting the rest of the message, select the message(s), go
to the 'Message' menu, and choose 'Remove Attachments'. Done!

Regards,
James.

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