ldd returns:
/usr/local/libexec/postfix/smtpd:
libsasl2.so.2 => /usr/local/lib/libsasl2.so.2 (0x280ab000)
libpam.so.3 => /usr/lib/libpam.so.3 (0x280bf000)
libcrypt.so.3 => /lib/libcrypt.so.3 (0x280c6000)
libssl.so.3 => /usr/local/lib/libssl.so.3 (0x280de000)
libcrypto.so.3 => /usr/local/lib/libcrypto.so.3 (0x281a5000)
libpcre.so.0 => /usr/local/lib/libpcre.so.0 (0x28295000)
libc.so.6 => /lib/libc.so.6 (0x282bd000)





And sockstat tells the following for port 465:

USER COMMAND PID FD PROTO LOCAL ADDRESS FOREIGN
ADDRESS
root master 611 14 tcp4 *:465 *:*