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Barracuda Email Protection alternatives: 5 apps ranked by verified data

Facts checked Nov 8, 2026AppBreakup editorialHow we rankAll email spam filters

Top picks

Common reasons people leave Barracuda Email Protection: no public per-user prices on the product page, and many separate modules make plans harder to compare. We ranked 5 alternatives by how directly each one replaces Barracuda Email Protection, then by reviews, real visits and how recently each app's facts were checked against its own website. Mimecast currently ranks first.

Quick comparison

#AppPricingVerified priceOpen sourcePlatformsVerified factsScore
1Mimecast logoMimecastPaid—NoWeb4 of 468.8
2Proofpoint logoProofpointPaid—NoWeb4 of 464.8
3Microsoft Defender for Office 365 logoMicrosoft Defender for Office 365Paid$2 per user/month (Plan 1, yearly)NoWeb4 of 461.8
4SpamTitan logoSpamTitanPaid—NoWeb, Self-hosted4 of 459.4
5Proxmox Mail Gateway logoProxmox Mail GatewayOpen source€540/year per hostNoSelf-hosted, Linux4 of 457.5
  1. Mimecast logo

    1. MimecastTop pick

    Best for: Companies wanting a hosted email gateway with continuity and archiving in the same contract

    PaidWeb

    68.8

    score / 100

    Why switch from Barracuda Email Protection

    Long-established secure email gateway with archiving and continuity for large organisations.

    Pros

    • MX gateway or API deployment, for cloud, on-prem or hybrid mail
    • Mail continuity if your own server goes down
    • Archiving, DMARC and training available on the same platform

    Cons

    • No public pricing; quote through sales or partners
    • Feature set and console can be a lot for small teams
    • Advanced modules cost extra on top of core filtering
    Visit Mimecast Details and reviews
    How this score is calculated
    Editorial fit ×0.3100
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Mimecast a good Barracuda Email Protection alternative?

    Verified facts

    4 of 4 verified
    Deployment
    MX-based or API-based
    Checked Nov 8, 2026mimecast.com(opens source in a new tab)
    Supported mail
    Microsoft 365, Google, on-prem, hybrid
    Checked Nov 8, 2026mimecast.com(opens source in a new tab)
    Email continuity
    Yes
    Checked Nov 8, 2026mimecast.com(opens source in a new tab)
    Customers
    42,000
    Checked Nov 8, 2026mimecast.com(opens source in a new tab)
  2. Proofpoint logo

    2. Proofpoint

    Best for: Large organisations that want gateway or API email protection plus DLP and training from one vendor

    PaidWeb

    64.8

    score / 100

    Why switch from Barracuda Email Protection

    Enterprise email security with deep threat intelligence, favoured by large regulated companies.

    Pros

    • Choice of inline gateway or API deployment for Microsoft 365
    • Attachment and URL sandboxing with post-delivery removal
    • Broad suite: DMARC, DLP, awareness training and archiving

    Cons

    • Quote-only pricing with no self-serve plan
    • Built for enterprises; heavy for very small businesses
    • Many features are split across separately sold modules
    Visit Proofpoint Details and reviews
    How this score is calculated
    Editorial fit ×0.387
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Proofpoint a good Barracuda Email Protection alternative?

    Verified facts

    4 of 4 verified
    Deployment
    API or secure email gateway
    Checked Nov 8, 2026proofpoint.com(opens source in a new tab)
    Microsoft 365
    API integration
    Checked Nov 8, 2026proofpoint.com(opens source in a new tab)
    Sandboxing
    Attachments and URLs
    Checked Nov 8, 2026proofpoint.com(opens source in a new tab)
    Supported platforms
    Microsoft 365, Google Workspace
    Checked Nov 8, 2026proofpoint.com(opens source in a new tab)
  3. Microsoft Defender for Office 365 logo

    3. Microsoft Defender for Office 365

    Best for: Organisations on Microsoft 365 that want stronger email security without another vendor.

    PaidWeb

    61.8

    score / 100

    Why switch from Barracuda Email Protection

    Built into Microsoft 365 and often already licensed, so there's no extra vendor for M365 shops.

    Pros

    • Already included in Business Premium and E5 licences
    • Covers Teams, SharePoint and OneDrive, not just email
    • Plan 2 links into Defender XDR for incident response
    • No MX record changes since it's built into Exchange Online

    Cons

    • Only protects Microsoft 365 mailboxes
    • Investigation and simulation tools need Plan 2
    • Annual per-user billing for the add-on
    Visit Microsoft Defender for Office 365 Details and reviews
    How this score is calculated
    Editorial fit ×0.377
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Microsoft Defender for Office 365 a good Barracuda Email Protection alternative?

    Verified facts

    4 of 4 verified
    Starting price
    $2 per user/month (Plan 1, yearly)
    Checked Nov 8, 2026microsoft.com(opens source in a new tab)
    Plan 2 price
    $5 per user/month (yearly)
    Checked Nov 8, 2026microsoft.com(opens source in a new tab)
    Free trial
    90 days (Plan 2)
    Checked Nov 8, 2026learn.microsoft.com(opens source in a new tab)
    Included in
    Microsoft 365 Business Premium, E3 (Plan 1), E5 (Plan 2)
    Checked Nov 8, 2026learn.microsoft.com(opens source in a new tab)
  4. SpamTitan logo

    4. SpamTitan

    Best for: IT teams and MSPs who want managed spam and phishing filtering in front of Microsoft 365 or a mail server

    PaidWeb, Self-hosted

    59.4

    score / 100

    Why switch from Barracuda Email Protection

    Lower-cost cloud spam filter aimed at small businesses and MSPs with simple setup.

    Pros

    • Cloud service, so there's no filtering engine to maintain
    • Sandboxing and dual antivirus for attachments
    • Adds a layer in front of Microsoft 365
    • User quarantine reports and per-domain policies

    Cons

    • No public prices; quotes only
    • Closed source, unlike SpamAssassin or Rspamd
    • Aimed at businesses and MSPs rather than individuals
    Visit SpamTitan Details and reviews
    How this score is calculated
    Editorial fit ×0.369
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is SpamTitan a good Barracuda Email Protection alternative?

    Verified facts

    4 of 4 verified
    Owner
    TitanHQ
    Checked Nov 8, 2026spamtitan.com(opens source in a new tab)
    Microsoft 365
    Integrates
    Checked Nov 8, 2026spamtitan.com(opens source in a new tab)
    Sandboxing
    Yes
    Checked Nov 8, 2026spamtitan.com(opens source in a new tab)
    Pricing
    By quote
    Checked Nov 8, 2026spamtitan.com(opens source in a new tab)
  5. Proxmox Mail Gateway logo

    5. Proxmox Mail Gateway

    Best for: Companies running their own mail servers who want a packaged filtering gateway with a web UI

    Open sourceSelf-hosted, Linux

    57.5

    score / 100

    Why switch from Barracuda Email Protection

    Free, open-source mail gateway you host yourself, a direct swap for an on-prem Barracuda filtering appliance.

    Pros

    • Complete gateway with web UI, quarantine and mail tracking
    • Bundles ClamAV antivirus and SpamAssassin
    • Open source and usable without a subscription
    • Subscriptions cover unlimited users and domains per host

    Cons

    • You run and maintain the gateway yourself
    • Support and the enterprise repository need a paid subscription
    • Relies on SpamAssassin, so it inherits its performance limits
    Visit Proxmox Mail Gateway Details and reviews
    How this score is calculated
    Editorial fit ×0.363
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Proxmox Mail Gateway a good Barracuda Email Protection alternative?

    Verified facts

    4 of 4 verified
    License
    GNU AGPLv3
    Checked Nov 8, 2026proxmox.com(opens source in a new tab)
    Starting price
    €540/year per host
    Checked Nov 8, 2026proxmox.com(opens source in a new tab)
    Users and domains
    Unlimited per subscription
    Checked Nov 8, 2026proxmox.com(opens source in a new tab)
    Filtering engines
    Postfix, ClamAV, SpamAssassin
    Checked Nov 8, 2026proxmox.com(opens source in a new tab)

The best Barracuda Email Protection alternative for…

The highest-ranked app in this list for each need.

Mimecast logo

Best Barracuda Email Protection alternative for most people

Mimecast

Long-established secure email gateway with archiving and continuity for large organisations.

Proxmox Mail Gateway logo

Best Barracuda Email Protection alternative for a free option

Proxmox Mail Gateway

Free, open-source mail gateway you host yourself, a direct swap for an on-prem Barracuda filtering appliance.

Proxmox Mail Gateway logo

Best Barracuda Email Protection alternative for Linux

Proxmox Mail Gateway

Free, open-source mail gateway you host yourself, a direct swap for an on-prem Barracuda filtering appliance.

Proofpoint logo

Best Barracuda Email Protection alternative for working in the browser

Proofpoint

Enterprise email security with deep threat intelligence, favoured by large regulated companies.

Barracuda Email Protection alternatives: common questions

What is the best alternative to Barracuda Email Protection?

Mimecast ranks first right now. Long-established secure email gateway with archiving and continuity for large organisations. Proofpoint and Microsoft Defender for Office 365 follow it in our ranking.

Barracuda Email Protection vs Mimecast: what's the difference?

Both Barracuda Email Protection and Mimecast are paid products. Both run on Web.

Is Barracuda Email Protection free?

Barracuda Email Protection is a paid product.

How much do Barracuda Email Protection alternatives cost?

Verified prices for the top-ranked Barracuda Email Protection alternatives: Microsoft Defender for Office 365, $2 per user/month (Plan 1, yearly); Proxmox Mail Gateway, €540/year per host. Each price was checked on the app's own site; see each card below for the date and source.

Is there a free alternative to Barracuda Email Protection?

Yes. Proxmox Mail Gateway (open source) has a free option. Check each app's verified facts for current plan limits.

Is there an open-source alternative to Barracuda Email Protection?

None of the 5 alternatives in this list is open source.

Which Barracuda Email Protection alternatives work on Linux?

Proxmox Mail Gateway runs on Linux.

Why do people switch from Barracuda Email Protection?

The complaints we hear most: no public per-user prices on the product page; many separate modules make plans harder to compare; more than a small team needs for basic spam filtering.

How is this list ranked?

Every app is scored with the same published formula: how directly it replaces Barracuda Email Protection, reviews (weighted by verification), visits from AppBreakup, how recently its facts were checked against its own website, and reader votes.