What feature does Mimecast offer regarding attachments?

Mimecast provides a feature called Attachment Protect, which focuses on security by scanning and neutralizing malicious attachments in real-time. This is particularly important in the context of email security, where attachments can be a common vector for malware and other cyber threats. By implementing this feature, Mimecast helps organizations safeguard their email communications, ensuring that harmful files are automatically detected and dealt with before they reach the user's inbox. This proactive approach significantly reduces the risk of security breaches associated with email attachments.

The other choices, while they may suggest useful features, do not align with the primary functionality offered by Mimecast related to attachments. For instance, the notion of encrypting attachments or compressing them touches on usability and privacy, but these capabilities are not the primary focus of Mimecast's attachment management. As such, the real-time scanning and neutralizing of potential threats through Attachment Protect stands out as a critical security measure in Mimecast's suite of email protection features.