We receive an error email including the attached message when sending email to any email to one of our customer (NOOR) . When using private emails (Gmail , Yahoo), This email message is not received so kindly advice.
This would essentially mean that you can only send mail from those two IP addresses. I recommend checking with your email provider to find out what IP your mail is sending from. You may need to update your SPF record. Hope that helps.
JesseW - GoDaddy | Community Manager | 24/7 support available at x.co/247support | Remember to choose a solution and give kudos.