MBP Spotlight: mimecast.com


Who hosts what mail? MBP Spotlight is the series here at Spam Resource ranking the top mailbox providers (including B2B) based on their counts of MX records in the top ten million domains. Some entries might have more info, some entries might have less, depending on what information I know about them and what information I can find online.

To count rankings, I took a snapshot of MX records for the top ten million domains, and then rolled them up based on the domain name hosting mail for each domain. That shows me how many domains have their inbound email hosted by hosted by “*.google.com,” “*.outlook.com,” etc.

Number 15 in the rankings: mimecast.com

Who is this? Mimecast.

What are they? According to Wikipedia: Mimecast Limited is an American–British, Jersey-domiciled company specializing in cloud-based email management for Google Workspace, Microsoft Exchange and Microsoft Office 365, including security, archiving, and continuity services to protect business mail.

How much mail do they host? Mimecast appears to host mail for more than 37,040 email domains based on a July 2024 snapshot of DNS and MX records.

If you’re finding mail rejected when trying to send to domains utilizing Mimecast, you can find more information related to Mimecast deliverability remediation over here in my Mimecast ISP deliverability guide.
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