This might be dumb but, can someone help me with E-Mail Workers?

So, I just got a new domain, and, wanted to make a E-Mail worker to sort out E-Mails sent to the domain.

Thing is, every time I try to import mimetext, it says Uncaught (in response) Error: No such module "mimetext".
imported from "worker.js"
.

Can someone help me? It's my first time using Workers.
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