Does Pulsar support JMAP like Fastmail?

Yes. Pulsar implements JMAP as specified in RFC 8620 and RFC 8621, alongside IMAP and SMTP. Tooling written against JMAP works against either server.

Can I migrate from Fastmail to Pulsar?

Yes, over IMAP. And the mbox export works from day one on Pulsar, so migrating back out is equally straightforward.

What does Pulsar cost compared with Fastmail?

Pulsar is free on a Pulsar subdomain for as long as you want it, and €4.00 per month for Pro, which adds your own domains, S/MIME and OpenPGP, and the deliverability report. No card is required to start.

Where is Pulsar hosted?

On EU infrastructure, operated from France, under GDPR, with a DPA available for business customers.

Comparison

Pulsar vs Fastmail

Fastmail wrote the JMAP specification, and we implemented it. This is the one comparison on the site where we start from broad agreement: both of these are real mail servers run by the people who wrote them.

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Feature by feature

Pulsar Mail compared with Fastmail, feature by feature
Feature	Pulsar	Fastmail
JMAPRFC 8620 / 8621	Yes	Yes
IMAP and SMTP on every plan	Yes	Yes
ManageSieveRFC 5804, server-side filters	Yes	Partial
Runs its own MTANot a reseller	Yes	Yes
MTA-STS and DANE outbound	Yes	Partial
Bring-your-own S3 archive	Yes	No
Full mbox export	Yes	Yes
Native mobile appsStandards clients only, for now	No	Yes
Years in operation	2026	1999

Where Pulsar is the better choice

Full ManageSieve

Pulsar exposes ManageSieve (RFC 5804) in full, so you can upload, download and version the Sieve script itself rather than driving filters through a UI.

MTA-STS and DANE enforced outbound

Pulsar enforces MTA-STS policies and DANE TLSA records on outbound delivery, and shows you the result per message rather than reporting an aggregate.

Bring your own S3 archive

Your archive can sit in an S3-compatible bucket you own and pay for directly. No other provider in this comparison offers it.

EU-hosted, EU-operated

Pulsar runs on EU infrastructure and is operated from France under GDPR. If EU data residency is a procurement requirement, that is a short conversation.

Where Fastmail is the better choice

Fastmail has been running since 1999 and ships native mobile apps. Pulsar launched in 2026 with standards clients only. Twenty-seven years of continuous operation is not a feature we can add, and if you want a first-party mobile app, Fastmail has one and we do not.

Common questions

Does Pulsar support JMAP like Fastmail?: Yes. Pulsar implements JMAP as specified in RFC 8620 and RFC 8621, alongside IMAP and SMTP. Tooling written against JMAP works against either server.
Can I migrate from Fastmail to Pulsar?: Yes, over IMAP. And the mbox export works from day one on Pulsar, so migrating back out is equally straightforward.
What does Pulsar cost compared with Fastmail?: Pulsar is free on a Pulsar subdomain for as long as you want it, and €4.00 per month for Pro, which adds your own domains, S/MIME and OpenPGP, and the deliverability report. No card is required to start.
Where is Pulsar hosted?: On EU infrastructure, operated from France, under GDPR, with a DPA available for business customers.