Yes — email.cm.com has IPv6.

Has both IPv4 (A) and IPv6 (AAAA) addresses.

B
IPv6 readiness
Works over IPv6, with one gap: its mail servers lack IPv6.
Website over IPv6
email.cm.com has 2 IPv6 addresses and answers on every one we tested.
✓ 2606:4700::6812:3ce answers · 443✓ 2606:4700::6812:2ce answers · 443
yes
Mail servers (MX) have IPv6
None of the mail servers has an AAAA record.
mx.email.cm.com ✗
no
Nameservers have IPv6
2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
donovan.ns.cloudflare.com ✓karsyn.ns.cloudflare.com ✓
yes
HTTPS over IPv6 · not part of the grade yet
Loads over IPv6 with a valid certificate: HTTP 403.
https://email.cm.com/ via 2606:4700::6812:3ce → 403
works
 Load email.cm.com over IPv6 from up to six other places — a second opinion.

What's keeping email.cm.com from an A

  1. Mail servers without IPv6
    mx.email.cm.com has no AAAA record, so mail from IPv6-only servers can't reach it directly. If a provider runs your mail, that's their setting; if you run it, add AAAA records for these hosts.

Check again

email.cm.com  Has IPv6

A (IPv4)104.18.2.206
104.18.3.206
AAAA (IPv6)2606:4700::6812:3ce
2606:4700::6812:2ce

Browsers on dual-stack networks will usually pick IPv6 here (the "Happy Eyeballs" algorithm races both and prefers v6).

Copy the evidence — a citation-ready record of this measurement

 Permanent link: aaaa.bot/r/lRsZ7_SkAB · How we measure

Checked 2026-10-31 12:48:04 UTC. Full DNS report: dns.pizza/domain/email.cm.com · JSON: /api/v1/email.cm.com