Here are the items removed when removing postfix:
Nov 1 09:56:59 localhost yum[22042]: Erased: google-chrome-stable Nov 1 09:57:00 localhost yum[22042]: Erased: redhat-lsb-compat Nov 1 09:57:00 localhost yum[22042]: Erased: redhat-lsb Nov 1 09:57:01 localhost yum[22042]: Erased: redhat-lsb-graphics Nov 1 09:57:01 localhost yum[22042]: Erased: redhat-lsb-printing Nov 1 09:57:02 localhost yum[22042]: Erased: redhat-lsb-core Nov 1 09:57:03 localhost yum[22042]: Erased: sysstat Nov 1 09:57:04 localhost yum[22042]: Erased: crontabs Nov 1 09:57:05 localhost yum[22042]: Erased: cronie-anacron Nov 1 09:57:06 localhost yum[22042]: Erased: cronie Nov 1 09:57:07 localhost yum[22042]: Erased: postfix
Seems odd to me that those items would need to be removed just because postfix is removed.
Thanks,
-wes