Will GMS Anti-Spam catch modified file extensions such as foobar."v"b"s"?
Microsoft Outlook will remove some extraneous characters from a
file attachment resulting in the actual change of the file name.
For example, a Unix user sends the file
to an Outlook user, Outlook will remove the "’s and make the file name
It seems that different builds of Outlook will treat the file differently.
In one version clicking on the paper clip icon in the preview pane displayed
the full name including " marks, another (same major version) copy displayed
the modified form.
Either way, Outlook will attempt to open the file by it’s new filename.
Can GMS Anti-Spam protect Outlook users from this exploit?
GMS Anti-Spam will strip out these characters prior to running the banned extension checks.
It should be noted that this is only a fix for an MS Outlook bug and would not affect any other clients. GMS Webmail was already immune to this type of attack.
Keywords:JUCE rejectattachext reject attachment extensions Spam checker GMS Anti-spam anti spam antispam