Kamatera

The VPS that doesn’t block port 25

Kamatera does not sell fixed instance sizes. The calculator starts at $4/mo — 1 vCPU (2667 MHz, “Type A – Availability”), 1 GB RAM, 20 GB NVMe SSD and 5 TB of traffic as published October 2026 — and every dimension moves independently, so a 2 vCPU / 16 GB / 40 GB box is a configuration rather than a plan you have to grow into. Pre-built tiers exist at $4, $25 and $39/mo, but they are starting points.

The same server can be billed hourly at $0.014/hr, charged by the minute. For anything you intend to destroy — a migration rehearsal, a load test, an n8n or Ollama experiment — this is the cheaper arithmetic: a server alive for two working days costs well under a dollar. A 30-day trial covers up to $100 of usage on one server.

Overages are published rather than quoted: $0.01 per extra GB of traffic and $0.05 per GB per month of extra storage. Daily backups are a paid add-on taken at 00:00 data-centre time with 14-day retention, and the price is not published. The managed-service tier (OS, database, web and mail server administration through Kamatera’s NOC) is quote-only.

Flat pricing — Kamatera belongs in the 1× group of our renewal tracker alongside DigitalOcean, Vultr and Hetzner. The calculator price is the ongoing price, with no promotional first term and no renewal step-up, which is the category norm for raw infrastructure and still worth stating.

The real budgeting trap is not renewal, it is what the $4 excludes. Add paid daily backups and the managed tier and a nominally $4 server stops resembling $4 — and because neither is publicly priced, you cannot model the true monthly cost from the website. Ask for both numbers in writing before you compare Kamatera against a provider that includes backups.

Renewal figures come from our Hosting Renewal Price Index — intro vs renewal pricing for every provider we cover, verified on vendor sites and dated.

Choose Kamatera if

• +Self-hosted mail — Kamatera’s FAQ states plainly that it “does not restrict Port 25 by default”, which DigitalOcean, Vultr, Linode, Hetzner and AWS Lightsail all do
• +Short-lived servers, where per-minute billing beats a monthly minimum
• +Workloads with an awkward hardware shape that fixed instance sizes waste money on
• +Teams that want a specific city — 25 locations, including several that the big three do not operate in

Look elsewhere if

• −You need a contractually meaningful uptime guarantee — read the SLA clause below first
• −You expect backups to be included, as they are on most managed plans
• −You want managed support at a published price rather than a sales quote
• −You are a beginner — this is raw infrastructure with a dense control panel, not a guided host

Standard self-managed VPS rules: you move your own bits, and leaving means restoring your own backups elsewhere. Two Kamatera-specific notes. First, the hourly option makes migration rehearsal unusually cheap — stand up the target, test the cutover, destroy it, pay cents. Second, if you are migrating a mail server specifically, do the reverse-DNS request before you cut over, not after: PTR records are granted by manual review (see limitations), and an unapproved PTR will hurt deliverability from the moment you flip DNS.

The uptime figure depends which page you read. Kamatera’s VPS pages advertise “99.95% up-time guaranteed”; the published Service Level Agreement guarantees 99.9% — “potential unavailability of 8 hours per each Service Year”. The remedy is one month of the failed service free, capped at $5,000 and limited to once per 12 months, claimable only in writing within 14 days of the incident. Kamatera then examines the claim “using its sole and exclusive discretion”, and the document reserves the right to reject any claim for compensation or credit “at KAMATERA’s sole discretion and for any reason”. Treat the uptime number as an operational target, not an enforceable promise.

Open port 25 is necessary for self-hosted mail but not sufficient. Reverse DNS (PTR) records are issued by manual review, and customers report refusals on the grounds that a site “does not appear to be a real, fully functional website” without a published criterion being cited. Deliverability also depends on the neighbourhood: CleanTalk recorded 53 spam-active addresses across 3,424 detected IPs on Kamatera’s AS36007 when we checked in October 2026 — a 1.55% rate, which is unremarkable for cheap hourly cloud but not zero. Check your assigned IP against the major blocklists on day one, while you can still ask for a different one.

Kamatera is owned by The OMC Group, which also owns VPSServer.com (acquired 2023), ClubVPS, JetServer and GNS Cloud Solutions. If you are comparing Kamatera against one of those on a third-party review site, you may be comparing two brands with the same owner rather than two independent competitors. We found no evidence of anything improper here — it is simply a disclosure almost no comparison of this category makes.

Public sentiment is genuinely split rather than merely mixed. Kamatera sits around 4.2/5 on Trustpilot across roughly 1,200 reviews, but the distribution is bimodal: infrastructure reliability and support responsiveness draw praise, while billing disputes and abuse-handling draw one-star accounts. We have not audited individual invoices, so we report the shape of the distribution rather than adjudicating it.

Alternatives to consider

• NetArt — loaded plans with a published sla
• IONOS — lowest first-year cost — if you plan the exit