rcpthosts error.

[Bob Ross]

I have a co-located server in my building route66web.com

I have qmail setup on this server. I thought I copied all the files and
changed everything for their service. All in-bound mail shows up fine.
When they try to send any email they receive this error.

553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)

What did I miss??.

Thanks in advance.

Bob Ross