Unverified50% confidenceFactExact time
Fastmail is the provider with the most complete JMAP support among commercial email services, and third-party email clients such as Mimestream have also begun supporting the JMAP protocol.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
9/11/2026
First Seen
Valid until: 12/10/2026
Sources
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