Note: Allow between 1 - 4 hour for this change to propagate and take effect across the Symantec.cloud infrastructure.
Configure Microsoft Office 365 to route its outbound email through Symantec.cloud.
See Enterprise organizations and Office 365 at Microsoft.com for more information.
A Sender Policy Framework (SPF) record is a type of Domain Name Service (DNS) TXT record that identifies which mail servers are permitted to send email on behalf of a domain. SPF records detect and prevent spammers from sending messages with forged "From" addresses on a domain. Symantec recommends that you include Symantec Email Security.cloud references in your SPF Record, even if your email is not generally routed outbound through Symantec.cloud. Including these references help prevent situations where email flows through Symantec servers for other reasons, such as email sent to another customer.
Implementing the SPF record also helps Symantec.cloud more accurately detect spoofed messages that pretend to be from your domain.
See the following knowledge base article to Implement SPF records in Email Security.cloud
Note: Make sure to set the TXT record TTL to the lowest possible to allow quick replication across DNS servers. It may take upto 24 hours for the TXT record to replicate across the internet.