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

Provides :
MTA
smtpd
smtpdaemon
/usr/bin/newaliases
/usr/sbin/sendmail
/usr/bin/mailq
/usr/bin/rmail
postfix

Requires :

libdl.so.2
libldap.so.2
/sbin/service
libresolv.so.2
libssl.so.2
cyrus-sasl => 2.1.10
fileutils
db4
libgdbm.so.2
/sbin/chkconfig
textutils
ld-linux.so.2
libc.so.6(GLIBC_2.2)
libnsl.so.1(GLIBC_2.0)
libc.so.6(GLIBC_2.0)
/usr/sbin/alternatives
openldap => 2.0.27
/usr/sbin/useradd
/bin/sh
libcrypto.so.2
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
openssl
libresolv.so.2(GLIBC_2.2)
/usr/sbin/groupadd
libpam.so.0
libcrypt.so.1
rpmlib(CompressedFileNames) <= 3.0.4-1
sh-utils
libc.so.6(GLIBC_2.1)
pcre
liblber.so.2
libnsl.so.1
libc.so.6
libdb-4.1.so
libsasl.so.7

Content of RPM :
/etc/pam.d/smtp.postfix
/etc/postfix
/etc/postfix/access
/etc/postfix/aliases
/etc/postfix/aliases.db
/etc/postfix/canonical
/etc/postfix/main.cf
/etc/postfix/main.cf.default
/etc/postfix/master.cf
/etc/postfix/pcre_table
/etc/postfix/post-install
/etc/postfix/postfix-files
/etc/postfix/postfix-script
/etc/postfix/regexp_table
/etc/postfix/relocated
/etc/postfix/transport
/etc/postfix/virtual
/etc/rc.d/init.d/postfix
/etc/sysconfig/saslauthd
/usr/bin/mailq.postfix
/usr/bin/newaliases.postfix
/usr/bin/rmail.postfix
/usr/lib/sasl/smtpd.conf
/usr/libexec/postfix
/usr/libexec/postfix/bounce
/usr/libexec/postfix/cleanup
/usr/libexec/postfix/error
/usr/libexec/postfix/flush
/usr/libexec/postfix/lmtp
/usr/libexec/postfix/local
There is 160 files more in these RPM.