Add a TXT or SPF record to a domain:
Login to your account. (https://secure.webhero.com).
Select the menu option Domain.
Click on a DNS. (https://secure.webhero.com/domain/dns).
Change dropdown to TXT or SPF.
Add Domain Name.
Click to set the value.
Input the text in the "Value" box popup.
Click on "Add Record".
The SPF Text String should be entered in the following format (for example):
v=spf1 MX ip4:126.96.36.199/24 ip4:188.8.131.52/24 -all
(The above SPF record, Specifies which IP addresses are allowed to send mail for mail.webhero.com.)
You can create the SPF record using an SPF wizard,https://www.spfwizard.net/.