Hmm ... It's impossible ;-) This RPM doesn't exist on any FTP server

Provides :
config(postfix)
dict_ldap.so()(64bit)
dict_pcre.so()(64bit)
dict_tcp.so()(64bit)
libpostfix-dns.so.1()(64bit)
libpostfix-global.so.1()(64bit)
libpostfix-master.so.1()(64bit)
libpostfix-milter.so.1()(64bit)
libpostfix-tls.so.1()(64bit)
libpostfix-util.so.1()(64bit)
postfix
postfix(x86-64)
smtp_daemon
sysvinit(postfix)
sysvinit(sendmail)
sysvinit(smtp)

Requires :

libc.so.6()(64bit)
libpcre.so.1()(64bit)
/usr/sbin/usermod
libdb-4.8.so()(64bit)
config(postfix) = 2.9.6-179.1
grep
coreutils
libresolv.so.2()(64bit)
diffutils
sysvinit(network)
libpostfix-util.so.1()(64bit)
liblber-2.4.so.2()(64bit)
sed
libpostfix-global.so.1()(64bit)
libpostfix-dns.so.1()(64bit)
fillup
libldap-2.4.so.2()(64bit)
/bin/grep
fileutils
insserv
libdl.so.2()(64bit)
libsasl2.so.2()(64bit)
/usr/bin/getent
textutils
libresolv.so.2(GLIBC_2.2.5)(64bit)
libc.so.6(GLIBC_2.14)(64bit)
libc.so.6(GLIBC_2.2.5)(64bit)
libc.so.6(GLIBC_2.3.4)(64bit)
/bin/awk
/usr/sbin/useradd
/bin/sh
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
libpostfix-master.so.1()(64bit)
netcfg
libpostfix-tls.so.1()(64bit)
sysvinit(syslog)
libnsl.so.1()(64bit)
libc.so.6(GLIBC_2.3.2)(64bit)
libcrypto.so.1.0.0()(64bit)
/usr/sbin/groupadd
rpmlib(CompressedFileNames) <= 3.0.4-1
iproute2
libc.so.6(GLIBC_2.7)(64bit)
sh-utils
rpmlib(PartialHardlinkSets) <= 4.0.4-1
libc.so.6(GLIBC_2.4)(64bit)
rpmlib(PayloadIsLzma) <= 4.4.6-1
systemd
libc.so.6(GLIBC_2.3)(64bit)
libnsl.so.1(GLIBC_2.2.5)(64bit)
/bin/sed
libc.so.6(GLIBC_2.11)(64bit)
/bin/bash
libdl.so.2(GLIBC_2.2.5)(64bit)
pcre
libssl.so.1.0.0()(64bit)
libpostfix-milter.so.1()(64bit)

Content of RPM :
/etc/init.d/postfix
/etc/pam.d/smtp
/etc/permissions.d/postfix
/etc/permissions.d/postfix.paranoid
/etc/postfix
/etc/postfix/LICENSE
/etc/postfix/TLS_LICENSE
/etc/postfix/access
/etc/postfix/aliases
/etc/postfix/bounce.cf.default
/etc/postfix/canonical
/etc/postfix/dynamicmaps.cf
/etc/postfix/generic
/etc/postfix/header_checks
/etc/postfix/helo_access
/etc/postfix/ldap_aliases.cf
/etc/postfix/main.cf
/etc/postfix/main.cf.default
/etc/postfix/makedefs.out
/etc/postfix/master.cf
/etc/postfix/openssl_postfix.conf.in
/etc/postfix/relay
/etc/postfix/relay_ccerts
/etc/postfix/relocated
/etc/postfix/sasl_passwd
/etc/postfix/sender_canonical
/etc/postfix/system
/etc/postfix/system/cond_slp
/etc/postfix/system/config_postfix
/etc/postfix/system/update_chroot
There is 176 files more in these RPM.