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

Provides :
MTA
config(postfix)
postfix
postfix(x86-64)
server(smtp)
smtpd
smtpdaemon

Requires :

libc.so.6()(64bit)
libssl.so.10()(64bit)
libpcre.so.1()(64bit)
rtld(GNU_HASH)
libcrypto.so.10(OPENSSL_1.0.1_EC)(64bit)
libresolv.so.2()(64bit)
liblber-2.4.so.2()(64bit)
libmysqlclient.so.18()(64bit)
rpmlib(PayloadIsXz) <= 5.2-1
libldap-2.4.so.2()(64bit)
libdb-5.3.so()(64bit)
libresolv.so.2(GLIBC_2.2.5)(64bit)
libcrypto.so.10(OPENSSL_1.0.2)(64bit)
libmysqlclient.so.18(libmysqlclient_18)(64bit)
libc.so.6(GLIBC_2.14)(64bit)
libc.so.6(GLIBC_2.2.5)(64bit)
libc.so.6(GLIBC_2.3.4)(64bit)
systemd-sysv
/usr/sbin/alternatives
libssl.so.10(libssl.so.10)(64bit)
/usr/sbin/useradd
/bin/sh
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
libc.so.6(GLIBC_2.3.2)(64bit)
libnsl.so.1()(64bit)
/usr/sbin/groupadd
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(CompressedFileNames) <= 3.0.4-1
libc.so.6(GLIBC_2.7)(64bit)
rpmlib(PartialHardlinkSets) <= 4.0.4-1
libc.so.6(GLIBC_2.4)(64bit)
libsasl2.so.3()(64bit)
libm.so.6()(64bit)
systemd
config(postfix) = 2:2.10.1-7.el7
libc.so.6(GLIBC_2.3)(64bit)
libc.so.6(GLIBC_2.11)(64bit)
libnsl.so.1(GLIBC_2.2.5)(64bit)
/bin/bash
libcrypto.so.10(libcrypto.so.10)(64bit)
libcrypto.so.10()(64bit)

Content of RPM :
/etc/pam.d/smtp
/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/sasl2/smtpd.conf
/usr/bin/mailq
/usr/bin/mailq.postfix
/usr/bin/newaliases
/usr/bin/newaliases.postfix
/usr/bin/rmail
/usr/bin/rmail.postfix
/usr/lib/sendmail
/usr/lib/sendmail.postfix
/usr/lib/systemd/system/postfix.service
/usr/libexec/postfix
/usr/libexec/postfix/aliasesdb
/usr/libexec/postfix/anvil
/usr/libexec/postfix/bounce
/usr/libexec/postfix/chroot-update
/usr/libexec/postfix/cleanup
/usr/libexec/postfix/discard
/usr/libexec/postfix/dnsblog
There is 206 files more in these RPM.