Sendmail and Cyrus Virtual Domains

[AJ]

Quoting Andrzej Adam Filip <anfi at xl.wp.pl>:


> Standard set of warm-up cheks:
> a) Have you pathed cf/m4/proto.m4? [required for FEATURE(`mrs') to work]
> b) Have you copied mrs.m4 and mrs_cyrus.m4 files to cf/features file
> directory?
> c) Have you replaced cf/mailer/cyrusv2.m4 file with modified version?
>
> If the above checks fail then check output of  the test command below:
>
> echo '3,0 existing-user at cyrus-virtual-domain' | sendmail -d21.12 -d60.5 -bt
>
> -d60.5  - trace map lookups
> -d21.12 - detailed trace of sendmail.cf processing
>

I have done all of these checks and I still get the same user unknown.  
  It seems like sendmail does not know about cyrus at all.  I am  
missing something big I think.