This site explains how to check your iController SPF records. Without SPF records all mails sent with iController have a higher probability to be marked as spam by the receivers. So for optimal iController usage we recommend you configure these records.
The SPF records should be configured on all domain names that you use to send
mails from using iController. For example when you send mails using
"email@example.com", then you should configure the records for the domain
The following should be added to the SPF records of your domain:
v=spf1 mx include:spf.icontroller.eu include:spf.protection.outlook.com -all
You can easily verify your SPF records by filling in the data below.