yum install error: No package sendmail-cf available

"yum install sendmail-cf" does not install the sendmail-cf package. Instead, it indicates there is no package available.

[root@hostname ~]# yum install sendmail-cf

Loaded plugins: security

Setting up Install Process

No package sendmail-cf available.

Nothing to do

[root@hostname ~]#

We tried the install using VNC and the GUI software updated, but the "sendmail-cf" package was not listed as available or installed.

Finally, I logged onto ULN, downloaded the sendmail-cf package from the appropriate, subscribed channel and successfully installed the package.

Of the 20+ Linux servers I installed sendmail-cf on today using "yum install sendmail-cf", two boxes displayed this error, requiring the manual rpm download from ULN. All servers are running OEL5 x86-64.