[Hampshire] [OT] Email query

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Author: Leo
Date:  
To: Hampshire LUG
Subject: [Hampshire] [OT] Email query
This isn't really Linux based but I'm hoping someone on the list might
know the answer as it's about email.
I've got a domain registered (call it, mydomain.org.uk) with an email 
address set up on it (say, email@???). I recently received 
an email addressed to aname@???. However, in the 
header of the email it said:
Received: from mail.somecompany.cn
    by ...
    for email@???


Can someone explain how it got to me. I understand you can put what you
like in the "from" field, by I thought the "to" field had to be valid.

TIA,
Leo

PS I don't have a catch all email address set up for the domain.