Some automated booking system mail from this contact (intelligentgolf.co.uk) does not get delivered. If a booking is made, their confirmation is not received, but a cancellation mail does arrive. They have checked and sent the following reply:
We have done some more testing on the issue and there seems to be a differences with the spam threshold between the booked and cancellation email. The cancellation email is a classed as lower spam than the booked email - which is being blocked. This could be because it may contain payment information. The emails from our end are being sent/attempted to be sent, so there is no error message that we are receiving. I would suggest either changing these settings and adding the intelligentgolf.co.uk to the list of safe senders.
I cannot see any way to add them as a 'safe sender' or 'whitelist', Is there any other solution?
Thanks for your responses, I have been out until now so hence slight delay. I have in my inbox an example of the mail that does arrive and I am waiting for a friend to send me a copy of the problem mail, from the same source, that does arrive in his inbox but not in mine - hopefully when he forwards it to me I will actually get it.
What email address do I forward these examples to?