Removing Evolution from "Send to" context menu in Ubuntu 5.10

I use Thunderbird email and calendar as my preferred application. (I've
set this in System-Preferences-Preferred Applications).
When I right-click a file or document and choose "Send to" all I get is
Evolution. Does anyone know how to change this?

Thanks
--
Registered Linux User no 240308
Ubuntu 5.10
gordonDOTburgessparkerATgbpcomputingDOTcoDOTuk
to email me replace the obvious!
.

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