#012318: Errors with slashes in attachment file names in mails

If the attachment file name contains a slash, the mail parser throws a warning and cannot save the attachment in the temporary folder.

The solution is to replace the slashes with underscores when the parsing process takes place.

Discovered by Dave Fischetti.

Operating System: Linux (for Windows the back slashes could be a problem also)
PHP Version: all
Database and version: n/a
Browser (and version): n/a

Parse the mail attached to the issue.