Random Notes

DKIM stands for Domain Key Identified Mail. It allows an organization to take responsbility to sign emails sent from its domains. It uses pub/private key to sign and allow receiver to verify the authenticity of the email. It prevent mail spoofing and proliferation attacks. OCI email delivery allows to configure DKIMs for email domains.When DKIM is created, it generates a CNAME record to be used in email domain configuraiton. Email Configuration Create a User and generate SMTP Credentials for that user. This user/credentials is used to login to the SMTP server. Create an approved sender in the Email Domain. This will be the from address. Attach a DKIM to the sender/domain.

NSG allows access control to a group of resources that have the same security posture. NSG consists of two items a security list and VNIC. Stateful Vs Stateless security rules: For high volume traffic it is recommended to you stateless security rules. This is because stateful security list tracks connection information to allow by directional traffic (response traffic to be sent). This state is stored in the compute instance and the network table might get full for high volume traffic.