I am moving my corporate email hosting from the old gmail free hosted gmail to ZOHO.

But a recipient of email (using google gmail) sees the following in the source file for an email that takes a long time to arrive.

Received-SPF: none (google.com: mark@mydomain.net does not designate permitted sender hosts) client-ip=74.201.84.155;

But I have added the spf record in my domain manager. BTW, I use Amazon Route 53. It is very resiliant when it comes to DDOS attacks.