Thanks for the replies!
@pilotbob:
Didn't know about Yahoo Pipes yet. Looks interesting together with FeedMyInbox. But on first attempt I was not able to bundle the articles for offline reading the same way as Calibre would do. Also I am in a kind of no chicken/mo egg deadlock with authetnification of the
xxx@kindle.com email. For FeedMyInbox to accept the Email it will need a reply. And for kindle.com to accept the sender it will need a reply.

Of course I could circumvent that by having a gmail relay in between...
@TuxGirl:
Having an installation of Calibre running online would be great. I was even consideringh to have the computer power up by a timer and then have calibre start automatic. But then again nobody will be able to watch it for a long time. Doesn't feel right to me. That's why I was looking for a 'Calibre Online I'll pack the news and send them for you' service. Wouldn't care if that would be a payed service (if reasonable priced). Maybe a way for calibre to generate money on top of donations?