This can be caused by a few things, depending on the mail and your preferences. The most
common reasons are as follows:
- The image may have been sent as an executable file. Executable files are potential
carriers of viruses or worms and are blocked by F-PROT AVES. Many worms try to
trick users into opening executables by claiming within the message body that the
file executable is really a harmless image.
- The image may never have been in the message to begin with. It is a common
mistake to attach a shortcut to an image instead of the image itself. When this
happens a file ending in ".lnk" is added to the mail. Shortcut files (.lnk files)
are potential carriers of viruses or worms and are blocked by F-PROT AVES.
- When high security is requested, F-PROT AVES verifies that the attachment file names match
the attachment content and other technical information present in the mail. If the information
does not all match, then the attachment may be renamed or removed as a preventative security measure.