Migrated to debian; aliases stopped working

[brownh@hartford-hwp.com (Haines Brown)]

When I moved to debian, my aliases are no longer working. For example,
in /etc/aliases I have the following entry:

   debian:	debian-user@lists.debian.org

However, when I try to send a message to debian, it sends a
message to debian@teufel.hartford-hwp.com, which is my FQDN attached
to the alias name. That is, the alias db is not being used. I ran
both # newaliases (which I did under RedHat/sendmal) and I ran #
postfix /etc/aliases (I'm now using postfix under debian).

I'm not sure, but is the first command associated only with sendmail,
and I should now use the second only? In any case, the /etc/alias.db
that builds is not being used when I send messages. 

Haines Brown