Forum Discussion
Exchange Online Protection SPF record
Hi, I have received a message sent via Exchange Online host IPv6 "2603:10a6:20b:c0::31". The message was marked as spam because of SPF fail. Subnet "2603:10a6:20b:c0::/64" is not in the list of O365 ...
If you think these messages are being sent by legit Exchange Online senders, then I would say it is the senders responsibility to check and modify their SPF records accordingly to ensure all legitimate entries are included.