I'd like to setup email using Google Apps for your Domain but can only enter 5 of the 6 required MX records due to limitations with number of host records I can enter (I'm using Zerigo DNS to host my DNS records):
aspmx.l.google.com
alt1.aspmx.l.google.com
alt2.aspmx.l.google.com
aspmx2.googlemail.com
aspmx3.googlemail.com
aspmx4.googlemail.com
aspmx5.googlemail.com (this one is not included)
Will emails be dropped if that last MX record is missing? What are the implications of not including the last MX record?