From what I can tell is that is came from a vodacom smtp server. I believe they have a public one set up for all their subscribers: smtp.vodacom.co.za or something like that. So all the users can basically use that mail server and send from anything@anything.co.za etc.
I've done it for my Company, but obviously use my Co SMTP and credentials, not to mention a believable email address. (which reminds me, I must see if it still exists =/)
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