[TriLUG] More POSTFIX questions?

[bp]

1.  In testing out my Postfix install I sent a message to 
bpevans at my-dyndns-pointer.org.  Now I see delivery  failed/deferred 
messages in the log.  How do I flush these messages out of the queue to 
avoid the repeated failures?

2.  What is involved in actually getting mail to my linux box from the 
outside world?  It'd be nice to have disposable email address for some 
things, like a bpe3 at my-dns-pointer.org etc.  I imagine I'd have to open 
port 25/tcp to the outside world.  I need a mx record associated with my 
dyndns.org address?  Does dyndns.org do this?

Thanks,
bp