New Spam – (No Subject) – (Unknown Sender)!
In my Gmail, just went to “Spam” folder to check whether any mail mistakenly went to spam. But there was another interesting mail which caught my eyes. An email with (No Subject) & (Unknown User)! Where email ID of sender is unknown. My concern is that if somebody may use this trick to do illegal things. Below is the screen shot:

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I’ve gotten one of these emails as well. No idea what the story is behind it.
I get these a lot.
you can see where they’re coming from by clicking on the down arrow next to the reply button on the top, and choosing show original. you can see which address it was from.
@fsimpro –
It can be traced out even by having a look on its header.
even if ‘show details’ is activated (as shown in the above screencap), there are NO details shown, ie, sender, subject and body are null. i often get these in my gmail Spam folder. gmail’s spam filters seem to get it right most of the time though, it’s rare that i see any spam in my Inbox, but there’s always lots of it in the Spam folder.
I get these in my inbox every day. At first I thought they were spam and just deleted them. Then I got brave (or stupid)and opened one up. They are legitimate messages from friends or companies I know. Why are they coming through as (no sender) (no subject)? One of these was even a reply to a message that had a subject. When they come through they have all of the coding imbedded making it very difficult to read the actual message.
I found another blog that speaks to this issue and gives a link to gmail support and wording to use when filing a problem report.
Here’s a link to the blog:
http://groups.google.com/group.....43a6956781
They all seem to think it is happening when mail is being forwarded from Yahoo. That could be the case with me.