Working on Kamatera: Cloud Servers, Firewalls, Billing and Port 25 Policy

Kamatera stands out for letting you configure servers component by component and for a global footprint that includes locations many providers skip, such as the Middle East. It is also one of the few cloud providers that does not restrict outbound port 25 by default, which makes it a common choice for teams running their own mail servers, and which carries responsibilities of its own. This guide covers the services, security features, billing, and how to use that port policy well. For configuring CPU, RAM and storage, see our Kamatera cloud servers guide.

What you can build on Kamatera #

Securing a Kamatera account and servers #

1. Use a strong, unique password and enable two-factor authentication on the account.
2. Configure the Cloud Firewall to filter inbound and outbound traffic and close every port you do not need.
3. Segment the network. Use private networking to separate public-facing web servers, a private application tier and databases with no public connectivity, the classic three-tier layout.
4. Encrypt traffic between servers so internal communication cannot be eavesdropped.
5. Audit regularly: review firewall rules, access and logs on a schedule.

Management essentials #

• Console organization: create, clone or delete servers from the management console while keeping consistent configurations across projects.
• Cost monitoring: review the billing dashboard; Kamatera offers both monthly and hourly billing, so check which each server uses.
• Least privilege for any additional users.
• Backups: configure backups for critical data and test a restore. Kamatera also markets backup servers as a common use case.

How Kamatera billing works #

• Monthly billing: prepay for a month of the server configuration at creation time.
• Hourly billing: variable cost based on whether servers are powered on or off, billed per minute of use.
• No long-term contract: upgrade, downgrade or cancel at any time.
• Traffic and storage add-ons: additional traffic and additional storage are billed per gigabyte.
• Payment methods: major credit and debit cards, including virtual and prepaid cards, with deposits also accepted by card or PayPal.
• Free trial: at the time of writing, a 30-day trial that includes a services allowance and included traffic, under Kamatera’s current terms.

Published plans at the time of writing start at a few dollars per month for a small server with included traffic; check Kamatera’s pricing page for current figures. Cost habits: use hourly billing for temporary workloads and monthly for steady ones, right-size servers, and watch traffic usage.

Port 25: open by default, so send responsibly #

Kamatera’s FAQ states that it does not restrict port 25 by default, which makes it an option for businesses that need unrestricted SMTP, such as running their own mail server or a control panel like Plesk with built-in mail. Independent reviews confirm the policy. An open port is not the same as good deliverability, though. If you run mail from a Kamatera server:

• Publish correct SPF, DKIM and DMARC records for every sending domain.
• Set reverse DNS on the server IP to match the mail server hostname.
• Monitor IP reputation and blocklists.
• Rate-limit outbound mail so a compromised account cannot burst spam.
• Handle bounces and complaints promptly and remove addresses that fail.
• Send only to people who asked to receive your mail. Kamatera’s acceptable use policy, like every provider’s, prohibits unsolicited bulk email.

For how other providers handle the same port, see SMTP port 25 on cloud servers.

Choosing a data center #

With locations across North America, Europe, Asia and the Middle East, the main decision is proximity to users and any data residency rules you must follow. Latency to a database matters more than latency to a web page, so keep application and database servers in the same location on a private network, and use a second location only for backups or a standby copy.

How teams use Kamatera #

Developers use hourly-billed servers for short-lived environments and the console’s clone feature to reproduce a configuration. Businesses run production web stacks on monthly-billed servers behind Load Balancers, choosing a data center close to their customers. Server hosting is a core use case, including self-hosted mail with the responsible-sending practices above. Web hosting customers run control panels such as Plesk or cPanel on configurable servers. Agencies keep each client on the client’s own account and are added as an additional user, which keeps billing and ownership where they belong.

A first-week checklist #

1. Enable two-factor authentication on the account.
2. Create the first server with only the CPU, RAM and storage you need; you can resize later.
3. Write Cloud Firewall rules that allow only required ports, and restrict management ports to known addresses.
4. Put databases on a private network with no public interface.
5. Configure backups and test a restore.
6. If you will send mail, publish SPF, DKIM and DMARC, set reverse DNS and configure rate limits before the first message.
7. Review the billing dashboard after the first month and switch temporary servers to hourly billing.

Official references #

Kamatera’s website hosts its product documentation, pricing and FAQ, including the port 25 statement. Our Kamatera platform overview summarizes the platform and how to sign up officially.

Frequently asked questions #

Does Kamatera really not restrict port 25?

Yes. Kamatera’s FAQ states that port 25 is not restricted by default, which is why it is chosen for self-hosted mail servers. Deliverability still depends on authentication records, reverse DNS and reputation.

How do I manage my Kamatera account?

Through the Kamatera Management Console, which covers servers, firewall rules, storage and billing.

Which billing mode should I choose?

Hourly for servers you will switch off or delete within the month; monthly for servers that run continuously.