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

Provides :
/etc/pam.d/smtp
/usr/bin/mailq
/usr/bin/newaliases
/usr/bin/rmail
/usr/lib/sendmail
/usr/sbin/sendmail
/usr/share/man/man1/mailq.1.gz
/usr/share/man/man1/newaliases.1.gz
/usr/share/man/man5/aliases.5.gz
/usr/share/man/man8/sendmail.8.gz
MTA
config(postfix)
server(smtp)
smtpd
smtpdaemon
postfix
postfix(x86-32)

Requires :

setup => 2.5.36-1
libmysqlclient.so.16
config(postfix) = 2:2.6.6-6.0.1.el6.centos
libsasl2.so.2
libcrypto.so.10(libcrypto.so.10)
libcrypto.so.10
postgresql-libs
rtld(GNU_HASH)
libcrypto.so.10(OPENSSL_1.0.1_EC)
libm.so.6
/sbin/service
libresolv.so.2
liblber-2.4.so.2
libc.so.6(GLIBC_2.4)
libpq.so.5
libc.so.6(GLIBC_2.1.3)
cyrus-sasl => 2.1.10
rpmlib(PayloadIsXz) <= 5.2-1
libc.so.6(GLIBC_2.7)
/sbin/chkconfig
libldap-2.4.so.2
libpcre.so.0
libssl.so.10(libssl.so.10)
libc.so.6(GLIBC_2.2)
libc.so.6(GLIBC_2.0)
libnsl.so.1(GLIBC_2.0)
/usr/sbin/alternatives
openldap => 2.0.27
mysql-libs
/usr/sbin/useradd
/bin/sh
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
libssl.so.10
libc.so.6(GLIBC_2.11)
openssl
libresolv.so.2(GLIBC_2.2)
libc.so.6(GLIBC_2.3)
/usr/sbin/groupadd
libc.so.6(GLIBC_2.3.2)
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(PartialHardlinkSets) <= 4.0.4-1
libc.so.6(GLIBC_2.1)
libcrypto.so.10(OPENSSL_1.0.1)
libmysqlclient.so.16(libmysqlclient_16)
/bin/bash
pcre
libdb-4.7.so
libnsl.so.1
libc.so.6
libc.so.6(GLIBC_2.3.4)

Content of RPM :
/etc/pam.d/smtp.postfix
/etc/postfix
/etc/postfix/access
/etc/postfix/canonical
/etc/postfix/generic
/etc/postfix/header_checks
/etc/postfix/main.cf
/etc/postfix/master.cf
/etc/postfix/relocated
/etc/postfix/transport
/etc/postfix/virtual
/etc/rc.d/init.d/postfix
/etc/sasl2/smtpd.conf
/usr/bin/mailq.postfix
/usr/bin/newaliases.postfix
/usr/bin/rmail.postfix
/usr/lib/sendmail.postfix
/usr/libexec/postfix
/usr/libexec/postfix/anvil
/usr/libexec/postfix/bounce
/usr/libexec/postfix/cleanup
/usr/libexec/postfix/discard
/usr/libexec/postfix/error
/usr/libexec/postfix/flush
/usr/libexec/postfix/lmtp
/usr/libexec/postfix/local
/usr/libexec/postfix/main.cf
/usr/libexec/postfix/master
/usr/libexec/postfix/master.cf
/usr/libexec/postfix/nqmgr
There is 182 files more in these RPM.