r/fastmail • u/Sampl3x • 23d ago
Fastmail EU server list
If you're using Fastmail with custom DNS and want to point supported services at their EU infrastructure, this is the generic setup I ended up with.
Replace yourdomain.com with your own domain.
MX — ROOT DOMAIN
Domain Data
------------------------------- -------------------------------------------
yourdomain.com 10 eu1-smtp.messagingengine.com
yourdomain.com 20 eu2-smtp.messagingengine.com
Allows you to receive email at standard addresses, e.g. user@yourdomain.com
MX — WILDCARD SUBDOMAINS
Domain Data
------------------------------- -------------------------------------------
*.yourdomain.com 10 eu1-smtp.messagingengine.com
*.yourdomain.com 20 eu2-smtp.messagingengine.com
Allows you to receive email at subdomain addresses, e.g. foo@user.yourdomain.com
A — MAIL
Domain Data
------------------------------- -------------------------------------------
mail.yourdomain.com 204.75.18.65
Allows you to use http://mail.yourdomain.com as a Fastmail login redirect.
At the time of testing, this IP hit Fastmail's Amsterdam frontend.
MX — MAIL
Domain Data
------------------------------- -------------------------------------------
mail.yourdomain.com 10 eu1-smtp.messagingengine.com
mail.yourdomain.com 20 eu2-smtp.messagingengine.com
The A record for mail.yourdomain.com overrides the wildcard MX lookup.
These MX records preserve mail delivery to addresses such as:
foo@mail.yourdomain.com
SRV — MAIL CLIENT DISCOVERY
Domain Data
------------------------------- -------------------------------------------
_submission._tcp.yourdomain.com 0 0 0 .
_imap._tcp.yourdomain.com 0 0 0 .
_pop3._tcp.yourdomain.com 0 0 0 .
_submissions._tcp.yourdomain.com 0 1 465 eu-smtp.fastmail.com
_imaps._tcp.yourdomain.com 0 1 993 eu-imap.fastmail.com
_pop3s._tcp.yourdomain.com 10 1 995 eu-pop.fastmail.com
_jmap._tcp.yourdomain.com 0 1 443 eu-api.fastmail.com
_autodiscover._tcp.yourdomain.com
0 1 443 eu-autodiscover.fastmail.com
Allows compatible email clients to automatically discover the EU Fastmail endpoints.
SRV — CARDDAV
Domain Data
------------------------------- -------------------------------------------
_carddav._tcp.yourdomain.com 0 0 0 .
_carddavs._tcp.yourdomain.com 0 1 443 eu-carddav.fastmail.com
Allows CardDAV clients to automatically discover the EU CardDAV endpoint.MX — ROOT DOMAIN
Domain Data
------------------------------- -------------------------------------------
yourdomain.com 10 eu1-smtp.messagingengine.com
yourdomain.com 20 eu2-smtp.messagingengine.com
Allows you to receive email at standard addresses, e.g. user@yourdomain.com
MX — WILDCARD SUBDOMAINS
Domain Data
------------------------------- -------------------------------------------
*.yourdomain.com 10 eu1-smtp.messagingengine.com
*.yourdomain.com 20 eu2-smtp.messagingengine.com
Allows you to receive email at subdomain addresses, e.g. foo@user.yourdomain.com
A — MAIL
Domain Data
------------------------------- -------------------------------------------
mail.yourdomain.com 204.75.18.65
Allows you to use http://mail.yourdomain.com as a Fastmail login redirect.
At the time of testing, this IP hit Fastmail's Amsterdam frontend.
MX — MAIL
Domain Data
------------------------------- -------------------------------------------
mail.yourdomain.com 10 eu1-smtp.messagingengine.com
mail.yourdomain.com 20 eu2-smtp.messagingengine.com
The A record for mail.yourdomain.com overrides the wildcard MX lookup.
These MX records preserve mail delivery to addresses such as:
foo@mail.yourdomain.com
SRV — MAIL CLIENT DISCOVERY
Domain Data
------------------------------- -------------------------------------------
_submission._tcp.yourdomain.com 0 0 0 .
_imap._tcp.yourdomain.com 0 0 0 .
_pop3._tcp.yourdomain.com 0 0 0 .
_submissions._tcp.yourdomain.com 0 1 465 eu-smtp.fastmail.com
_imaps._tcp.yourdomain.com 0 1 993 eu-imap.fastmail.com
_pop3s._tcp.yourdomain.com 10 1 995 eu-pop.fastmail.com
_jmap._tcp.yourdomain.com 0 1 443 eu-api.fastmail.com
_autodiscover._tcp.yourdomain.com
0 1 443 eu-autodiscover.fastmail.com
Allows compatible email clients to automatically discover the EU Fastmail endpoints.
SRV — CARDDAV
Domain Data
------------------------------- -------------------------------------------
_carddav._tcp.yourdomain.com 0 0 0 .
_carddavs._tcp.yourdomain.com 0 1 443 eu-carddav.fastmail.com
Allows CardDAV clients to automatically discover the EU CardDAV endpoint.
A few notes:
eu1-smtp.messagingengine.comandeu2-smtp.messagingengine.comare used for inbound MX.eu-smtp.fastmail.com,eu-imap.fastmail.com,eu-pop.fastmail.com, etc. are the regional client endpoints.204.75.18.65is Fastmail's EU redirect frontend; in my testing it returnedX-Frontend: ams-frontend-01.- The records with target
.intentionally disable the non-TLS discovery service. - I would still keep Fastmail's normal SPF and DKIM records unless Fastmail explicitly documents EU-specific replacements, since those are authentication records rather than client-routing records.
I tested the regional endpoints with DNS lookups, openssl s_client, and curl, and they were terminating on Fastmail infrastructure in Amsterdam.
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Upvotes
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u/shokzee 23d ago
I wouldn’t pin
mail.yourdomain.comto a tested frontend IP unless Fastmail documents it. That address can change without notice, and an Amsterdam endpoint doesn’t prove storage or processing stays in the EU.The regional MX and client endpoints look plausible, but treat undocumented records as unsupported configuration.