your problem is not in your mail/postfix configuration.
i'd try to ping and dig your main domain (com-tec.ca) and its resolve correctly, but in your mercure machine still didnt resolve and time out.
You can wait the propagation like till's said above if your dns configuration is correct.
Just corious, do you had point your mercure in your domain manager correctly in futurcom.ca ?
from whois answer : your domain com-tec.ca is managed in futurcom.ca (cmiiw)
--- whois ---
$ whois com-t*c.ca
Domain name: com-t*c.ca
Last edited by Sinchan; 19th May 2010 at 06:42.
Reason: delete dash