It doesn't look like a spam - it looks like an intimidation.
The common denominator - in header there is every time a line:
All headers look like this:
Using: my email address
Message Status: Opened
Reply To: (different names) @Receivia.com
From: (different name)
And there goes crap about some actions related to a daily office activity.
There is a signature and even a telephone number at the bottom.
Names and phones are not fake! I called once and got a real person that knows nothing about me.
Sometimes they use my name - I mean an acronym in my e-mail address - means they don't know my real name.
This all looks like a war between celular providers to discourage a usage of Blackberry telephones!
These mails have one common feature that differ them from a spam. No offers, no cheap program to buy, no pharmacy, no penis enlargment.
Looks like you see other people emails and only sometimes they are aimed to you.