Please update the Google Apps MX records to match Google’s recommended setup:
Currently they are defaulting to:
MX 10 ASPMX.L.GOOGLE.COM.
MX 20 ALT1.ASPMX.L.GOOGLE.COM.
MX 20 ALT2.ASPMX.L.GOOGLE.COM.
MX 30 ASPMX2.GOOGLEMAIL.COM.
MX 30 ASPMX3.GOOGLEMAIL.COM.
MX 30 ASPMX4.GOOGLEMAIL.COM.
MX 30 ASPMX5.GOOGLEMAIL.COM.
It functions for now, however it throws a warning when you check your domain with the Google Apps Toolbox: https://toolbox.googleapps.com/apps/checkmx/
While this is possible manually, it should be done automatically when you use the automated method: https://support.google.com/a/answer/37956?hl=en