What i want to achieve:

1.) select a message
2.) press a button (or drag it to a zimlet, or have an option in the right click menu)
3.) the selected messages gets forwarded to a specific external email address (e.g.: something like bugtracker@mycompany.com)

4.) Optional the mail is then moved to another folder and / or tagged

So the full picture is that there are some large inboxes that are managed by a couple of support employees. Some of the messages get forwarded to an external bugtracker system - this is decided by the support employees. since they get a lot of messages it is no option to always press forward and select the right contact.

i tried it with filters but since i can not really use them after i already received the mail...

any hint would be great!!!