SPF records are a type of DNS TXT record commonly used for email authentication. SPF records include a list of IP Addresses and domains authorized to send emails from that domain.

Please have the following SPF record added to your public DNS.
Name: (domain name) ex: greenorbit.com
Type: TXT
Value: v=spf1 mx include:mail.hostid.net ~all
In the SPF record we ask that include:mail.hostid.net is added, as this includes a list of all of our mail servers which can potentially be used to send outbound email.