JustEmails vs Fastmail: Which Custom Domain Email Provider Fits You?

Last Tuesday, a consultant in my network pinged me about email hosting. She'd been on Fastmail for three years — loved the webmail, loved the calendar integration, loved basically everything about it. Then she started a second business. Added two contractors. Suddenly she's looking at $180/year instead of $60/year, and the per-user math hit different — the same per-seat trap we unpacked in our Zoho Mail comparison for small businesses.

That conversation happens more than you'd expect. Fastmail is genuinely excellent for individual power users. The webmail client feels like a native app. The keyboard shortcuts work. The search actually finds things. But the moment you add users or domains, the pricing model starts working against you.

JustEmails took a different approach: $49/year flat, unlimited domains, unlimited mailboxes. No per-user fees. No per-domain fees. Whether you're running one domain or forty, the price doesn't change.

So which one should you pick? Depends entirely on what you need. If you're evaluating multiple providers, our business email pricing survey covers the full landscape. Here's the honest rundown.

Quick Verdict

TL;DR: Fastmail wins for individual power users who want best-in-class webmail, native calendar/contacts, and don't mind paying $5-6/user/month. JustEmails wins for small teams, agencies, and anyone managing multiple domains — the flat $49/year pricing makes the math obvious at scale.

If you're one person with one domain who lives in your email client all day, Fastmail is probably worth the premium. If you're running email across multiple domains or adding team members, JustEmails saves you real money without sacrificing the basics.

Feature-by-Feature Comparison

Feature	JustEmails	Fastmail
Pricing model	Flat $49/year per account	Per-user monthly ($5-6/user/mo)
Starting price	$49/year (~$4.08/mo)	$60/year Standard ($5/mo × 12)
Domains included	Unlimited	Limited by plan
Mailboxes included	Unlimited	Per-user (1 mailbox = 1 user fee)
Storage	10 GB included; +100 GB blocks at $100/year	30-100 GB per user by plan
Webmail	Clean, purpose-built UI	Desktop-class app (industry-leading)
Calendar/Contacts	No	Yes (native, polished)
IMAP/SMTP	Full access	Full access
Mobile apps	Third-party clients	Native iOS/Android apps
SPF/DKIM/DMARC	Auto-configured	Supported (some manual setup)
Transactional API	Bundled (1K/mo free)	No
Company history	2025	1999 (25+ years)

The pricing structures reflect different philosophies. Fastmail charges per user because they're selling a premium experience — and they deliver it. JustEmails charges a flat annual fee because we think email infrastructure shouldn't scale with headcount. Both approaches make sense for different buyers.

Where Fastmail Wins

I'll be honest: Fastmail does some things better than we do. Here's the real list.

Webmail Experience

Fastmail's webmail client is probably the best browser-based email interface that exists. The keyboard shortcuts mirror desktop apps. The search is fast and accurate. The conversation threading actually works. Dark mode looks good. It feels like using a native Mac app, not a web page.

JustEmails has a clean, functional webmail UI. It works. Honestly? It's not going to win design awards. I've had users tell me they wish our inbox search was faster — fair criticism, we're working on it. We're not competing with Fastmail on polish — we're competing on price and flexibility. If you spend 8 hours a day in webmail and that experience matters deeply to you, Fastmail is worth the per-user premium. We know our lane.

Calendar and Contacts

Fastmail includes native calendar and contacts apps. They sync over CalDAV and CardDAV. The calendar interface is actually usable — not a bolted-on afterthought like some competitors. For users who want email, calendar, and contacts in one provider without touching Google, Fastmail delivers.

JustEmails is email-only. We don't bundle calendar or contacts. Is that frustrating for some users? Probably. You can use any CalDAV/CardDAV provider alongside us (Proton Calendar, iCloud, self-hosted solutions), but we don't provide it ourselves. Different scope, intentionally. We'd rather do email well than calendar poorly. (And yes, I've gotten the "why don't you just add calendar" email approximately forty times. It's on the maybe-someday list.)

Track Record

25 years. Fastmail has been running email since 1999. They've survived every wave of competition — the rise of Gmail, the Outlook rebrand, the Yahoo implosion. They're privately held, profitable, and not going anywhere.

JustEmails shipped in 2025. Yeah, we're the new kid. We're backed by Velocity Digital Labs, the same team behind ClickzProtect and VeloCards. But Fastmail's longevity is a real advantage for risk-averse buyers. If you'd rather wait three years until we've proved ourselves? Totally fair.

Privacy Focus

Fastmail is based in Australia and has built their brand on privacy. No ads. No selling data. Clear privacy policies. For users specifically seeking a privacy-focused alternative to Gmail, Fastmail's reputation matters.

JustEmails doesn't sell data either — email hosting shouldn't work that way — but we don't have 25 years of privacy advocacy behind us. Fastmail can point to a track record; we're building ours. For a privacy-first approach to web analytics, check out how JustAnalytics handles user data without the tracking baggage.

Where JustEmails Wins

Now the flip side. Here's where flat-rate pricing changes the equation.

Multi-Domain Economics

The math gets obvious fast. Let's say you're an agency managing email for 8 client domains with 2 mailboxes each. That's 16 mailboxes total.

Fastmail Standard: 16 users × $5/mo × 12 months = $960/year

JustEmails: $49/year flat. All 8 domains. All 16 mailboxes. Same price.

Even if we're generous and assume Fastmail's team pricing brings that down to $800/year, JustEmails still costs 94% less. That's not a typo. We ran the same agency math against MXroute, another flat-rate provider, if you want a second data point.

Here's my unpopular opinion: per-user pricing for email is a legacy of enterprise software thinking that doesn't fit small teams. Email infrastructure costs basically nothing per additional mailbox. The marginal cost is near zero. Charging $5/user/month is a business model choice, not a technical requirement. If you're running multiple domains — especially if you're an agency, freelancer, or SaaS founder with several products — the per-user model works against you. We covered this in detail in our post on the true cost of running 10 brand domains on Google Workspace vs flat-fee email.

Adding Team Members

This one gets me.

JustEmails lets you create unlimited mailboxes at no extra cost. Want to add support@, billing@, hello@, and personal addresses for five employees? Go ahead. It's included.

Fastmail charges for each user. Every real person who needs email access is another $5-6/month. For a 5-person team, that's $300-360/year on Fastmail vs. $49/year on JustEmails (plus $2/member/month for team management access if you want shared admin controls — still way cheaper).

Bundled Transactional Email

JustEmails includes 1,000 transactional emails/month at no extra cost. Need to send password resets, order confirmations, or signup notifications? Use our REST API — see our breakdown of when to use SMTP vs an API if you're deciding how to wire it up. Need more volume? Add $25/year per 10K-email tier.

Fastmail doesn't offer transactional email at all. You'd need a separate service — SendGrid, Postmark, Resend, or Amazon SES — adding another vendor and another bill. For SaaS founders and small businesses, bundling transactional and mailbox email into one provider simplifies everything.

DNS Auto-Configuration

Setting up SPF, DKIM, and DMARC correctly is tedious. I've botched it myself more times than I'd like to admit — spent two hours once debugging a DKIM failure that turned out to be a missing period in a DNS record. Most providers hand you a list of DNS records and wish you luck. JustEmails verifies your DNS automatically, shows green checkmarks when records are correct, and tells you exactly what's wrong when they're not.

Fastmail supports all the authentication standards, but the setup involves more manual steps. Not a dealbreaker for technical users — but for small business owners who just want email to work, guided DNS setup removes a real friction point. Our DMARC guide covers this in depth, and our custom domain email setup tutorial walks through the full process.

Pricing Breakdown

As of May 2026, here's what each service actually costs.

JustEmails:

• All-In Plan: $49/year — unlimited domains, unlimited mailboxes, 10 GB included
• Storage add-on: +100 GB for $100/year (stackable)
• Transactional API: 1K/mo included free; +$25/year per 10K-email tier
• Team members: $2/member/month (owner included free)
• Trial: 7-day free trial, card required

Fastmail:

• Standard: $5/user/month ($60/year) — 30 GB storage, 1 custom domain
• Professional: $6/user/month ($72/year) — 100 GB storage, more domains, priority support
• Family/team discounts available but still per-user

For a solo user with one domain, Fastmail Standard at $60/year and JustEmails at $49/year are close enough that the webmail quality difference might justify the $11 premium.

For a 5-person team with 3 domains? Fastmail: $300/year minimum. JustEmails: $49/year. Plus the transactional API you'd otherwise pay extra for elsewhere. The gap is $251/year — enough to matter.

Who Should Pick What

Choose Fastmail if:

• You're a solo power user who values webmail UX above all else
• You need integrated calendar and contacts from the same provider
• You're not planning to add many users or domains
• The brand's 25-year privacy track record matters to you
• You live in your email client and want the best possible interface

Choose JustEmails if:

• You're managing multiple domains (agencies, freelancers, portfolio owners)
• You're adding team members and don't want per-seat pricing
• You need transactional email and don't want another vendor
• You're migrating from Google Workspace to cut costs — check our Google Workspace alternatives guide
• Budget matters more than webmail polish

Either works if:

• You're technical enough to set up DNS records yourself
• You don't need enterprise features (archiving, compliance, audit logs)
• You want custom domain email without the Google/Microsoft tax
• You're sending under 10K emails/month

The Honest Take

Fastmail and JustEmails are both solid email providers. Neither is Google Workspace, and that's the point for both of us.

Fastmail is the Lexus of email hosting — polished, premium, and priced accordingly. If you're one user who wants the best possible experience and doesn't mind paying for it, Fastmail is genuinely excellent. No sarcasm. I've used it.

JustEmails is the Honda Accord — reliable, affordable, gets the job done without fuss. We're not trying to out-polish Fastmail's webmail. We're trying to make custom domain email affordable for people who need more than one mailbox or more than one domain.

The decision comes down to: do you need one premium seat, or do you need many affordable seats? Answer that, and the choice makes itself. Simple as that.

(And look — if you try JustEmails and it's not for you, the 7-day trial exists for exactly that reason. No hard feelings.)

Questions? support@justemails.app — real humans, usually within a few hours. Check out more comparisons on the JustEmails blog, or see how we stack up against MXroute and Microsoft 365. And if you're curious about what else Velocity Digital Labs is building, take a look at JustAnalytics for privacy-first web analytics or VeloCards for virtual card payments.

Frequently Asked Questions

Is Fastmail worth it for a single power user?

Yes — if you want polished webmail, native calendar/contacts, and you're the only user. Fastmail's $5/month Standard plan gives you 30 GB storage and a genuinely nice interface. The math changes when you add users or domains. At 3 users, you're paying $180/year. JustEmails costs $49/year total regardless of how many mailboxes you create. So: one person who values the desktop-class webmail? Fastmail. Multiple users or domains? JustEmails wins on cost.

Can I migrate from Fastmail to JustEmails?

Straightforward. Both support full IMAP access. Export from Fastmail using any desktop client like Thunderbird or Apple Mail, then import to JustEmails via IMAP. JustEmails also has built-in migration tools that can pull directly from IMAP sources while preserving your folder structure. DNS cutover takes 15 minutes — update MX records, add SPF/DKIM entries, and you're live. Budget 1-2 hours per mailbox depending on archive size.

Does Fastmail support unlimited domains like JustEmails?

Not exactly. Fastmail lets you add custom domains, but there are limits based on your plan tier. Standard allows 1 domain, Professional allows up to 100 aliases but still limits domains. JustEmails includes unlimited domains on the flat $49/year plan — no restrictions, no per-domain fees. If you're managing email for 10+ domains (common for agencies and freelancers), the pricing gap widens fast.

Which has better spam filtering — JustEmails or Fastmail?

Both are solid. Fastmail has been refining their spam filters for 25 years and it shows — their false positive rate is low. JustEmails runs Rspamd plus ClamAV, which catches most threats. For typical business email, you won't notice much difference. Fastmail might edge it slightly for users who receive high volumes of borderline newsletters and need precise filtering. Real talk: neither is going to let obvious spam through.

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Try JustEmails

Unlimited custom domain email hosting for $49/year flat — unlimited domains, unlimited mailboxes, 10 GB storage, full IMAP/SMTP. Built for agencies, freelancers, and anyone managing email across more than one domain.

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