I'm not sure if you are asking about e-mail folders only or everything from the old MacBook., but if the latter, Migration Assistant (in your Utilities Folder) is the most effective method. It does require that your two Macs be connected in some way (there are multiple options). Start the Assistant and it will walk you through the process.
Forget Stuffit. That's a compression utility. Does it even run on 10.x?
Now if you are only asking about transferring Mail folders, etc. there is an option in Mail: File>Import Mailboxes... . What I can't tell you is where to find the Apple Mail mailboxes since I don't use it as my primary e-mail client and I find numerous folders labeled "Mail" scattered throughout my User Library and Application Support folder. Perhaps someone can provide a more specific location. Of course, once this is determined this folder on your MacBook would need to be placed on the iMac. A USB flash drive can assist with this part.
On a Mac since 1984. Currently: 24" M1 iMac, M2 Pro Mac mini with 27" BenQ monitor, M2 Macbook Air, MacOS 14.x; iPhones, iPods (yes, still) and iPads.
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