Rapid elasticity is a cloud feature that allows cloud services to scale up or down automatically according to demand or load on the server, without requiring manual intervention or configuration changes by users or administrators.This enables cloud services to provide optimal performance and efficiency at all times, as well as reducing costs by only using resources when needed.

If users are experiencing decreased bandwidth and connectivity issues in a Wi-Fi mesh network, the technician should use a Wi-Fi analyzer to determine whether the channel in use is overcrowded and to identify which channel the mesh network should use for best performance.

Spam management records help others deal with spam claiming to come from your domain.
Many servers ignore your mail if you don't set them up. Organizations that manage their own e- mail may run an anti-spam gateway server to dust out spam sent to their users. If so, this anti- spam gateway appliance will also check and enforce the DKIM, SPF, and DMARC records of domains that send it mail.
DMARC is designed to fit into an organization's existing inbound email authentication process.
The way it works is to help email receivers determine if the purported message "aligns" with what the receiver knows about the sender...Reduce successful phishing delivery.
In other words, it validates authenticity of incoming emails. Looks like the company is receiving phishing emails from multiple fake senders.