DNS

DNS Records

All record types resolved from authoritative DNS for fastmail.com.

A 1 record

103.168.172.65

MX 2 records

20 in2-smtp.messagingengine.com.
10 in1-smtp.messagingengine.com.

TXT 1 record

"v=spf1 include:spf.messagingengine.com ~all"

NS 2 records

fmns1.messagingengine.com.
fmns2.messagingengine.com.

CAA 8 records

0 issuewild "letsencrypt.org"
0 issuewild "pki.goog; cansignhttpexchanges=yes"
0 issue "comodoca.com"
0 issue "digicert.com; cansignhttpexchanges=yes"
0 issue "letsencrypt.org"
0 issue "pki.goog; cansignhttpexchanges=yes"
0 issuewild "comodoca.com"
0 issuewild "digicert.com; cansignhttpexchanges=yes"

SOA 1 record

fmns1.messagingengine.com. postmaster.messagingengine.com. 2026050500 86118 600 1209600 3600

Registration

WHOIS / RDAP

Registration data for fastmail.com via the RDAP protocol, with port-43 WHOIS fallback if RDAP is unavailable.

whois via rdap.org

Registrar

Gandi SAS

Created

1994-12-09T05:00:00Z

Updated

2025-08-01T04:05:10Z

Expires

2034-12-08T05:00:00Z

Handle

129713_DOMAIN_COM-VRSN

Nameservers

FMNS1.MESSAGINGENGINE.COMFMNS2.MESSAGINGENGINE.COM

Status

client transfer prohibited

TLS

SSL Certificate

Live TLS handshake against fastmail.com. No third-party scanner.

ssl 48 days remaining

Issuer

CN=R12,O=Let's Encrypt,C=US

Subject

CN=*.fastmail.com

Valid from

2026-04-02T00:19:47+00:00

Valid to

2026-07-01T00:19:46+00:00

Serial

448376948878616802681088907090404636532844

SANs (4)

*.caldav.fastmail.com*.carddav.fastmail.com*.fastmail.comfastmail.com

Reconnaissance

Subdomains discovered

Aggregated from Certificate Transparency logs (crt.sh, certspotter, hackertarget) with DNS bruteforce fallback if all CT sources fail.

⚠ Partial results — crt.sh status 429 · certspotter rate-limited · hackertarget limited: API count exceeded - Increase Quota with Membership

subdomains 54 found

crt.sh status 429 certspotter rate-limited hackertarget limited: API count exceeded - Increase Quota with Membership dns-brute ok +54 (wordlist 54)

admin.fastmail.com
administrator.fastmail.com
api.fastmail.com
app.fastmail.com
apps.fastmail.com
assets.fastmail.com
autoconfig.fastmail.com
autodiscover.fastmail.com
beta.fastmail.com
blog.fastmail.com
cdn.fastmail.com
cpanel.fastmail.com
demo.fastmail.com
dev.fastmail.com
dns1.fastmail.com
dns2.fastmail.com
docs.fastmail.com
email.fastmail.com
ftp.fastmail.com
help.fastmail.com
imap.fastmail.com
m.fastmail.com
mail.fastmail.com
mail2.fastmail.com
media.fastmail.com
mobile.fastmail.com
mx.fastmail.com
mx1.fastmail.com
mx2.fastmail.com
my.fastmail.com
new.fastmail.com
ns1.fastmail.com
ns2.fastmail.com
ns3.fastmail.com
old.fastmail.com
pop.fastmail.com
pop3.fastmail.com
portal.fastmail.com
remote.fastmail.com
secure.fastmail.com
shop.fastmail.com
smtp.fastmail.com
stage.fastmail.com
staging.fastmail.com
static.fastmail.com
status.fastmail.com
store.fastmail.com
support.fastmail.com
test.fastmail.com
vpn.fastmail.com
webdisk.fastmail.com
webmail.fastmail.com
whm.fastmail.com
www.fastmail.com

Email

Email Security Posture

SPF and DMARC presence and records for fastmail.com. DKIM requires a known selector and is not auto-discoverable.

SPF present

v=spf1 include:spf.messagingengine.com ~all

DMARC present

v=DMARC1; p=none; rua=mailto:e3936a44@inbox.ondmarc.com

DKIM selector required

DKIM requires selector; not auto-discoverable

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fastmail.com

DNS Records

WHOIS / RDAP

SSL Certificate

Subdomains discovered

Email Security Posture

Run this on any domain.

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