Contact support rather than replying directly to e.mail.

I cannot stress this enough--NEVER, EVER REPLY TO AN EMAIL WITH AN UNKNOWN SENDER.  Don't think about it.  Don't read it.  Delete it immediately.

Even if an email looks blank, it could contain a 1-pixel image that links to a virus or bot script.  Sometimes, just passing your mouse over these micro-images can launch a script, such as a tracking script that tracks your web surfing.

it wasn't exactly an unknown sender.  it was the fact that it was blank that it was suspicious.  YOu can only tell this by openning it I assume?

No. I can tell before opening it, strange though it may sound.

I use an anti-spam program called Mailwasher which gives me a list of e-mails waiting on the server, and which allows me to delete unwanted ones, or even bounce them (making it look as if my e-mail address doesn't exist), before I download them to my computer.

It also allows me to look inside e-mails to see what they contain before I download them. That's how I knew this e-mail was blank.

Of course I contacted support, and this was the reply I received ...

Thank you for contacting us.
This is a legitimate  email address of Dreamstime.
Most likely this was sent by accident. We apologize for any inconvenience.

So ... problem solved.