If you are configuring a domain on Google Apps  and the domain name server for that domain is running on BIND just add this records to the zone file. Just change "change.me"  to yourdomain.us. change.me. 1H IN MX 1 ASPMX.L.GOOGLE.COM. change.me. 1H IN MX 5 ALT1.ASPMX.L.GOOGLE.COM. change.me. 1H IN MX 5 ALT2.ASPMX.L.GOOGLE.COM. change.me. 1H IN MX 10 ALT3.ASPMX.L.GOOGLE.COM. change.me. 1H IN MX 10 ALT4.ASPMX.L.GOOGLE.COM.