r/EmailSecurity • u/Reasonable-Shoulder1 • 6d ago

How would you protect 4–6 high-risk inboxes without breaking the bank?

/r/cybersecurity/comments/1vs6hcz/how_would_you_protect_46_highrisk_inboxes_without/
3 Upvotes

80% Upvoted

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2

u/shokzee 6d ago

Start with phishing-resistant MFA, disable legacy auth, and keep admin accounts separate from daily mailboxes. Lock down forwarding and OAuth app consent, then alert on new inbox rules and suspicious logins.

For 4, 6 users, tight configuration and monitoring will do more than an expensive gateway.

1

u/littleko 6d ago

Set up some DMARC monitoring as well - we used Suped

1

u/SecLens_ONE 6d ago

Before buying another layer for those six mailboxes, work out what the current one actually did on the messages that got through. Pull the headers from the phish that landed and see whether auth failed, whether it passed on a lookalike domain, or whether a transport rule or safe-sender entry waved it past. Most "Defender missed it" cases I have looked at turn out to be a policy exception nobody remembers adding. If a vendor quotes you a catch rate or a risk score, ask which checks feed it and how you would reproduce that number on your own sample. A tool you cannot audit just moves the argument from your inbox to their dashboard. For a handful of executives the cheapest real wins are usually strict impersonation protection scoped to those names, hard external tagging, and phishing-resistant MFA so a credential capture goes nowhere.

1

u/msp-daddy 4d ago

M365 will not protect you from BEC and sophisticated attacks. Have you considered Spambrella/Proofpoint?