firewall
In the zone
Other emails can be searched by Google. Yes, you can peep on it.
The idea is, one Google advanced search string is filetype: . It is used to find out any file only. Now I'm using this string as a tool,I am searching for filetype:eml eml intext:"Content-Type: image/jpeg".
Look at the keyword. It is finding a file with extension eml and that eml should have a Line Content-Type: image/jpeg. Now remember the old days, MIME encoding of a email. When ever we are attaching a .jpg file, that line should come in .eml file. So, the full keyword is searching for filename any with extension .eml which is email file extension, and it should contain a .jpg file, may be some photo or other picture from the web. You can't belive if you are not checking it yourself.

The idea is, one Google advanced search string is filetype: . It is used to find out any file only. Now I'm using this string as a tool,I am searching for filetype:eml eml intext:"Content-Type: image/jpeg".
Look at the keyword. It is finding a file with extension eml and that eml should have a Line Content-Type: image/jpeg. Now remember the old days, MIME encoding of a email. When ever we are attaching a .jpg file, that line should come in .eml file. So, the full keyword is searching for filename any with extension .eml which is email file extension, and it should contain a .jpg file, may be some photo or other picture from the web. You can't belive if you are not checking it yourself.
Code:
filetype:eml eml intext:"Content-Type: image/jpeg"