I am trying to use SMTP Outbound Relay and i have correctly set up SPF record to include relay.dynu.com bu after sending less than 30 test mails i have had two incidents where the sending SMTP server is not included in your SPF settings in relay.dynu.com. Please fix an include all SMTP servers used
My SPF is
v=spf1 ip6:2603:10a6:803:41::31 include:relay.dynu.com -all
The ip6:2603:10a6:803:41::31 is one server witch is not covered in relay.dynu.com
SPF show as Ok in MX Toolbox