Fastmail SSL certificate status
Valid — 83 days until expiry(fastmail.com)
This page shows the Fastmail SSL certificate as served by fastmail.com, read from a live TLS handshake by an independent CertPost probe and rechecked hourly: expiry, issuer, hostname coverage, the full chain, and the negotiated protocol.
Last checked 2026-09-20 07:46 UTC. CertPost is not affiliated with Fastmail.
Certificate details
Hostnames this certificate covers
*.api.beta.fastmail.com, *.api.dogfood.fastmail.com, *.api.fastmail.com, *.api.qa.fastmail.com, *.beta.fastmail.com, *.caldav.fastmail.com, *.carddav.fastmail.com, *.dogfood.fastmail.com, *.fastmail.com, *.qa.fastmail.com, fastmail.com
Certificate chain as served
Common questions
Is the Fastmail SSL certificate expired?
At the last check, the certificate fastmail.com serves was within its validity period. It expires on 2026-12-13, 83 days from that check.
When does the Fastmail SSL certificate expire?
The certificate fastmail.com is currently serving expires on 2026-12-13 (83 days from the last check). Large services rotate certificates long before that date.
Who issued the Fastmail SSL certificate?
The certificate was issued by YR2.
How is this checked?
A CertPost probe opens a real TLS connection to fastmail.com on port 443 and reads the certificate the server presents, the same way a browser does. The result is cached and refreshed hourly.
Fastmail rotates certificates without downtime. Your own domains are the ones that expire quietly — watch 3 free, no card.
Monitor your certificatesOr run a one-off check with the free SSL checker.