Comparison
SuperMailOS vs Fastmail
Fastmail is what email enthusiasts recommend to each other — fast, independent, privacy-respecting, with excellent alias handling. If one person needs great email on a few domains, it's superb. The comparison gets interesting when domains multiply and deliverability becomes someone's job.
| Fastmail | SuperMailOS | |
|---|---|---|
| Pricing model | Per user, tiered by storage; standard plans in the mid-range per user | Per mailbox: Pro $4/mo ($3 annual, 3 domains), Business $6/mo ($5 annual, unlimited domains) |
| Aliases | Generous masking/alias features ( incl. an alias domain ) | Unlimited free aliases on every domain — business role addresses, not masking |
| Custom domains | Supported; domain count multiplies with user tiers | Unlimited on Business — the multi-domain case is the product |
| Deliverability | Solid infrastructure; DKIM/DMARC setup is self-serve | Managed: authentication from the server zone, warmup, DMARC parsing, dashboard |
| Positioning | Personal/family power email | Business email for portfolios of domains |
Where Fastmail wins
- The interface. Genuinely fast, thoughtfully keyboarded, refined over two decades — enthusiasts are right.
- Masking. Fastmail's alias/masking system ( with a dedicated alias domain ) is excellent for personal privacy use.
- Independence and longevity. A profitable, focused, no-ads company that has outlived most of its competitors.
Where SuperMailOS wins
- Role aliases at business scale. Masking is for people; hello@/support@/billing@ per product, delivering into shared real inboxes, is a different shape — and here they're unlimited and free.
- Every domain, one inbox, one bill. Running five product domains or a roster of client domains: add them, verify DNS, done — no per-user-domain tier math.
- Deliverability as a service. The mail server is operated for you — records generated from its zone, DMARC reports parsed, warmup and IP reputation managed, per-domain visibility in one dashboard.
Which one fits you
A person or family who wants the best personal email: Fastmail is great — this isn't a rivalry. Business mail across many domains where deliverability is load-bearing: that's the job SuperMailOS was designed for. Pricing is per mailbox with a 14-day free trial.
FAQ
Can I use SuperMailOS with my favorite mail client?
Yes — IMAP and SMTP come standard, so Fastmail-trained habits ( or any client ) carry over.
Do you support catch-all addresses?
Unlimited aliases on every domain cover the role-address pattern; catch-all-style behavior is achievable through alias setup on the domain.
I already own domains on Fastmail — how hard is the move?
Point MX at the managed server via the generated DNS records, verify, migrate mailboxes over IMAP. Under five minutes per domain before the data move.
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