Comment Re:I've been forced to move off outlook.com (Score 1) 52
If you use a forwarding rule to forward emails sent to your hotmail address, then the sender is still the original address and the final recipient server will reject the email because it doesn't comply with the SPF rules on that original address (i.e. that SPF record doesn't include the hotmail servers).
You state it's an intermediary server in outlook that gives the error: that's correct, that server is talking to the expensify server which rejects the email, so the error is reported by the intermediate.