| Availability | April 1st, 2026 |
| Product(s) |
Email Security - MX
,
CyberGraph |
| Who's affected | All Email Security - MX-deployed customers who do not currently have CyberGraph or Advanced BEC Protection enabled. |
Overview
Mimecast is pleased to announce the enabling of Social Graph as a baseline contextual signal across eligible Secure Email - MX customers. Social Graph builds a map of communication relationships within your organization, helping Mimecast more accurately identify messages from unknown or unusual senders and improve the detection of sophisticated email-borne threats.
This change is non-disruptive and requires no configuration changes by administrators or end users. The initial introduction does not impact mail flow while in Monitor Mode. However, Mimecast will gradually switch customers over to Hold Mode starting May 4th, 2026, as part of a phased rollout that will continue until the end of June 2026.
This is also a foundational step toward the broader rollout of Multi-Vector Threat Protection (MVTP).
For details, see the full article Social Graph Activation FAQ.
- Customers who have previously opted out of Social Graphing (existing opt-outs are honored; no new opt-outs are being accepted at this time).
- Customers already using CyberGraph or Advanced BEC Protection (these customers already benefit from Social Graphing as part of those services).
What's Changing
- Social Graphing is enabled by default for eligible Email Security MX-based customers (excluding those with CyberGraph or Advanced BEC Protection or who have opted out).
- Multi-Vector Threat Protection will activate in Monitor Mode for a short period of time after Social Graphing is enabled. This will then be followed by a change to Hold Mode from May 4th, 2026, for the first wave of customers.
- A new policy (“CyberGraph Learning Mode Default”) will appear in the CyberGraph Policies menu for each enabled customer.
- This is not a rollout of Advanced BEC Protection for all – this remains a distinct, higher-tier capability.
If you have concerns about this change or would like to discuss your organization’s eligibility or opt-out options, please contact your Mimecast Account Management team, your Customer Success Manager (CSM), or Mimecast Support.
Comments
Please sign in to leave a comment.