If the Email notifications option is enabled, the control panel will automatically send emails to customers on the reseller's behalf for various actions related to an order. However, sometimes these emails get flagged as spam or blocked by certain email clients and the customers do not receive these emails or miss them as they are marked as spam.
To solve this issue you need to add the following SPF record to your domains DNS zone,
yourdomainname.com IN TXT 14400 "v=spf1 include:_spf.myorderbox.com ~all"
Where,
yourdomainname.com is the Hostname
14400 is the TTL value in seconds
"v=spf1 include:_spf.myorderbox.com ~all" is the SPF record to be added in the value field.
This is only applicable if you own the domain name and can modify the DNS records for the domain. If you are using a third party email provider such as Gmail, Yahoo, Hotmail etc. this solution will not work. We recommend you to change the Sales email address in the control panel to an email with a custom domain name. To modify the email address navigate to the Contact Information page and under General Sales Contact Information update the Email address.