As a lot of ppl found out, sending a mail to chello.nl is hard to do with your own MTA on a consumer broad-band connection. The consumer ranges are blocked by Chello/UPC 
But we can hack it… al you need is access to a non-blocked MTA (i.e. smtp.xs4all.nl)… And I use sendmail as a MTA… and sendmail got the feature mailertable With this feature you can override the mx-records out of the DNS-server… So I added the next line:
chello.nl smtp:smtp.xs4all.nl
And now I can deliver mail to chello.nl via smtp.xs4all.nl. 
