Add googles SPF record as below. This will help prevent the spam issue.
Create a new TXT record with the following values:

  1. In the Name/Host/Alias field, enter @ or leave it blank. Your other DNS records might indicate which one you need.
  2. In the Time to Live (TTL) field, enter 3600 or leave the default.
  3. In the Value/Answer/Destination field, enter v=spf1 ~all