destination smtp

Hi,

well I'm looking for an option to deliver mails to a smtp server which 
is running on another system. I think there is no module to do this. As 
I'm a programmer, I think about writing such a module.

This is my idea:
[destination]
type = externalSMTP
server = "IP or dns"
user = "username"
password = "password"

So getmail fetches the mails as usual an resend it to an smtp server.

My questions:
1. Is there something like this I didn't found?
2. Do you see any problems to use this method?

kind regards
Jan