Someone

jmkasunich@ke-main-1006:~/emcdev/emc2head$ ldd /usr/local/bin/esmtp
        linux-gate.so.1 =>  (0xffffe000)
        libesmtp.so.5 => not found
        libdl.so.2 => /lib/tls/i686/cmov/libdl.so.2 (0xb7f3d000)
        libpthread.so.0 => /lib/tls/i686/cmov/libpthread.so.0 (0xb7f2b000)
        libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0xb7dfc000)
        /lib/ld-linux.so.2 (0xb7f52000)
jmkasunich@ke-main-1006:~/emcdev/emc2head$ find /usr -name libesmtp.so.5
/usr/local/lib/libesmtp.so.5