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Mimecast among Y Combinator companies

Mimecast was detected on 18 of 5,386 crawled Y Combinator company websites, a share of 0.3%.

Read from each domain's MX record, and for domains behind an email gateway from its SPF record, not from the homepage.

5,386 of 6,133 Y Combinator domains returned a usable record and form the denominator. 5,242 were counted from a rendered homepage crawl on 4 September 2026, 144 from a plain fetch only, and 747 returned no usable record. Email hosting and email security are read from each domain's MX and SPF records, for the same domains. Company list: Y Combinator company directory. <5 means fewer than 5 crawled domains in that group. Rank 2 of the 4 Email Security tools published for this group.

Software used by Y Combinator companies · Email Security across all groups

<a href="https://installmap.com/groups/yc/mimecast"><img src="https://installmap.com/badges/yc/mimecast.svg" alt="Mimecast runs on 18 of 5,386 crawled YC companies (0.3%)"></a>

[![Mimecast runs on 18 of 5,386 crawled YC companies (0.3%)](https://installmap.com/badges/yc/mimecast.svg)](https://installmap.com/groups/yc/mimecast)

Other Email Security tools in this group

• Proofpoint 0.8%
• Cloudflare Email Security 0.1%