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Email Security APIs
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Popular first highlights editorial picks, then ranks providers by monthly downloads of mapped SDKs on npm and PyPI (latest refresh 2026-10-26; unavailable measurements retain older counts). Others follow A–Z.
Agari
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Egress Switch
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HacWare
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IRONSCALES
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Material Security
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Mimecast
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OnDMARC
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Runbox
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Tessian
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Zivver
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Zix
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