Enterprise email security

Immune vs Mimecast

Mimecast covers the employee mail estate. Immune covers the open doors on your website and pitch materials, where strangers must be able to write you without handing the inbox to bots and sellers.

About Mimecast

Different jobs

Mimecast combines email security, archiving, and continuity for mid-market and enterprise teams, typically sold per user.

CapabilityImmuneMimecast
Best atChallenge-gated public and team addressesSecurity, archive, and continuity for the workforce
Unknown strangersChallenge, then deliver or dropPolicy and threat intel decide deliver vs quarantine
Virtual gateway inboxesYes, with per-inbox destinationsNo (protects mailboxes on your platform)
BuyerOps, support, and growth teams owning public addressesIT and security owning the mail platform

Choose Immune when

Public and shared inboxes are the pain

  • Public addresses need to stay reachable to real humans without drowning in outreach.
  • You want a product your support lead can set up without an email security RFP.
  • You already have (or do not need) full-suite archiving and continuity.

Mimecast may still fit when

You need something else

  • You need journaling, long-term archive, and continuity for every mailbox.
  • IT wants one vendor for security policy across Microsoft 365.

Protect the inboxes filters leave open

Put a challenge gateway in front of support@, contact@, and the other addresses you publish.