Sun has released temporary patches for the lastest sendmail vulnerability.
More informations can be found at:
http://supportforum.sun.com/cgi-bin/WebX.cgi?13@191.wMvAak8bkok^0@.eeb7a0d

RPMs are available at:
ftp://ftp-eng.cobalt.com/pub/experimental/security/sendmail/ <server-type>

Since I installed the pkgmaster.com patch, should I be fine with that or should I install the new rpm or should I wait for the official patch?

I think you are fine. The pkgmaster patch closed the vurn.

Robbert