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Upload all new (smaller) images to your media library.
For each large image in the page/post text editor, replace the img src with the smaller image URL, if you leave the larger image as the a href URL, on click, the larger one will show, which shouldn't be a problem.
Page load time should decrease.
If you delete all of the larger images, you must delete/change the a href URL or a 404 error page will appear.
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Did anybody ever get an answer to this? Is it possible to brand the report email itself and set a personalised return email address?
It just depends on how many images we're talking about. If it's not many, then just do it manually.
If there are loads, use a plugin like the lads have mentioned above.
Doing it manually will give you some good practice on WordPress too.