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.