Hi our company recently changed from exchange 5.5 to exchange 2000. internal mail is just perfect but external mail won't work. my guess is theres a problem with the dns, but i really cant figure out how to set the MX record in dns. the problem is that our internal domain name is 'corp.moellenbeck.com' wheter our registered ISP-mail-domainname is ' how can i get exchange to work properly? i am grateful for every hint i get 