Originally Posted by
abligh
I wouldn't rely on this. Yes "contact.ba.com and contact.britishairways.com are valid British Airways subdomains", but the statement "If you have emails from those addresses they will be from BA" is false. It is trivially easy to forge a From address on an email. It has all the security of the sender address on a physical letter. On the other hand if they know your personal details, that itself is a very good sign that the communications are genuine.
While this is all true, my guess would be that these emails were indeed from BA. Not least because if there were instances of people receiving emails apparently from those addresses but faked, we would probably have heard about it on here already.