Log in to your account at gandi.net .

Switch to custom DNS version.

Select expert .

In the Build Zone field, enter the following information:
@ 28800 IN MX 1 ASPMX.L.GOOGLE.COM.
@ 28800 IN MX 3 ALT1.ASPMX.L.GOOGLE.COM.
@ 28800 IN MX 3 ALT2.ASPMX.L.GOOGLE.COM.
@ 28800 IN MX 5 ASPMX2.GOOGLEMAIL.COM.
@ 28800 IN MX 5 ASPMX3.GOOGLEMAIL.COM.

Click Submit .

Click Submit again to accept the change.