Cloud-based Email Security Top Companies
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Cisco Systems Inc.
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Proofpoint Inc.
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Trend Micro Inc.
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Fortinet Inc.
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Broadcom Inc.
*Disclaimer: Top companies sorted in no particular order

Cloud-based Email Security Market Concentration

Cloud-based Email Security Company List
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Barracuda Networks Inc.
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Proofpoint Inc.
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Mimecast Ltd.
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Cisco Systems Inc.
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Trend Micro Inc.
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Microsoft Corporation
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Google LLC (Google Cloud)
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Fortinet Inc.
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Broadcom Inc. (Symantec)
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Check Point Software Technologies Ltd.
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Sophos Group PLC
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Forcepoint LLC
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Dell Technologies Inc.
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Zscaler Inc.
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Cloudflare Inc.
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Ironscales Ltd.
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Egress Software Technologies Ltd.
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Trellix (Musarubra US LLC)
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OpenText Cybersecurity
Specific to Cloud-based Email Security Market