Best MSP Email Security tools in 2026

Inline or API-based phishing, BEC and malware filtering per mailbox.

Mesh Security

Mesh

MSP-native email security with an outstanding multi-tenant console, month-to-month billing and PSA-aware provisioning.

$1.75

per mailbox / mo

$1.75–$1.75 quoted

API A

Tenancy 5/5

Month-to-month

No minimum

5.0/5 from 1 MSPs

Check Point

API-based inline email security for M365 with strong BEC detection and no MX record change.

$2.10

per mailbox / mo

$2.10–$2.10 quoted

API B

Tenancy 4/5

1 year

No minimum

4.0/5 from 1 MSPs

Proofpoint

Gateway-based SMB email security with archiving options and a long MSP track record.

$1.85

per mailbox / mo

$1.85–$1.85 quoted

API C

Tenancy 4/5

1 year

25 unit minimum

3.0/5 from 1 MSPs

What is Email Security in an MSP stack?: Email Security stands for Email Security & Anti-Phishing. Inline or API-based phishing, BEC and malware filtering per mailbox.
What are the best Email Security tools for MSPs in 2026?: We track 3 Email Security products: Mesh Security, Avanan (Check Point Harmony), Proofpoint Essentials. Each one is listed with crowdsourced pricing, seat minimums, contract terms, API grade and verified MSP reviews so you can rank them against your own size.
What is the cheapest Email Security option?: On reported list pricing, Mesh Security is the lowest at $1.75 per mailbox / mo. The cheapest headline price is rarely the cheapest total once seat minimums and add-on modules are applied.
Which Email Security vendors have no seat minimum?: Mesh Security, Avanan (Check Point Harmony) are reported without hard seat minimums, which matters most below 150 endpoints.