What is a business mail server (dedicated mail server)?
A business mail server is an email server that runs on CPU, RAM and disk resources reserved exclusively for your company's email traffic. With shared email hosting, many customers use the same physical infrastructure and plans are usually limited by number of accounts or storage per mailbox. With a hosted mail server, the resources are yours: you decide how many accounts to create, how to distribute quotas and which sending policies to apply.
Limitsiz Bulut's cloud mail server plans run on Xeon Platinum processors and NVMe storage in the Tier III certified COMNET data center. Every plan includes unlimited email accounts, bulk email sending, MAPI/ActiveSync (an Exchange-like experience) and Zimbra compatibility. In other words, you do not pay per user; your price is based on the server's resources.
Unlike buying a physical server and installing it in your office, a cloud mail server takes away the operational burden of hardware failures, power outages and software updates. Our team handles setup, monitoring and infrastructure maintenance; you simply manage your accounts.
When should you choose a mail server over shared email?
For small teams, business email plans are usually the most economical starting point. But if one or more of the following apply to you, a dedicated mail server is the better fit:
- You have many users: With dozens or hundreds of employees, a fixed resource model with unlimited accounts lowers your total cost compared with per-user pricing.
- You send bulk email: Shared business email has an hourly sending limit (250 per hour). For businesses that send customer notifications, dealer announcements or newsletters, a mail server allows bulk sending.
- You want Exchange-like sync: With MAPI/ActiveSync, email, calendars, contacts and tasks sync instantly between Outlook and mobile devices, giving you a similar experience without Exchange licensing costs.
- You have large archives: Years of correspondence, large attachments and department mailboxes are covered by 250 GB to 1000 GB of NVMe storage, with extra disk available when needed.
- Isolation and performance matter: Because resources are reserved for you, other customers' load does not affect you.
If you want full root access to install and manage everything yourself, a VDS server is also an option. In that case, however, installing the mail software, security updates, spam filtering and IP reputation management are entirely your responsibility. A managed mail server removes that burden.
Capacity planning: choosing a plan by user count
Two measures drive the choice of a mail server: total storage and concurrent load (CPU/RAM). To estimate storage, multiply your number of users by the average mailbox size and leave at least 20–30% headroom for growth.
Estimating average mailbox size
- Light users (field staff, shared addresses): 1–2 GB
- Typical office staff: 3–5 GB
- Heavy users (management, finance, design, sales): 10 GB or more
Example scenarios
| Scenario | Estimated storage | Recommended plan |
|---|---|---|
| 40 users × 4 GB average | 160 GB + headroom ≈ 210 GB | Mail Server 250 |
| 80 users × 4 GB average | 320 GB + headroom ≈ 420 GB | Mail Server 500 |
| 120 users × 5 GB average | 600 GB + headroom ≈ 750 GB | Mail Server 750 |
| 150+ users or heavy archives | 750 GB and above | Mail Server 1000 or extra resources |
Treat this table as a starting point. Where many users connect via ActiveSync at the same time, bulk sending is frequent or large attachments are common, choosing a plan with more CPU and RAM keeps performance smooth. Use the configurator on this page to set CPU, RAM, disk and user count and see the matching plan; if you need more than our plans offer, request a custom quote for extra CPU, RAM and NVMe storage.
What do MAPI/ActiveSync and Zimbra compatibility give you?
A standard IMAP connection only syncs email. Calendars, contacts and tasks are managed separately, which leads to problems such as a meeting invite appearing on one device but not another. With MAPI/ActiveSync support, your mail server talks to Outlook and iOS/Android devices much like Exchange does:
- Push email: New messages arrive on the phone instantly instead of waiting for the device to poll the server.
- Calendars and meetings: A meeting invite created in Outlook also appears in your phone calendar, and accept or decline responses sync across every device.
- Contacts and shared address book: The company directory stays up to date on every employee's device.
- Tasks and notes: Agendas and to-do lists stay in sync between desktop and mobile.
Zimbra compatibility lets you use collaboration features such as email, calendars, tasks and document sharing right in the browser via webmail. Existing Zimbra users keep their familiar interface, which makes switching easier.
Bulk email on a mail server: doing it right
Our mail server plans allow bulk sending, but its success depends as much on your sending habits as on the infrastructure. To keep inbox placement high, follow these principles:
- Use opt-in lists: Never send to purchased or non-consensual lists; it is risky for both reputation and compliance. Make sure commercial messages follow the applicable rules in your target markets (for Turkey, including IYS registration).
- Ramp up gradually: Rather than sending tens of thousands of emails from a new server on day one, increase volume over several days to build IP reputation.
- Use a separate address: Send newsletters and campaigns from a dedicated address such as
newsletter@to protect your personal correspondence addresses. - Clean bounces: Remove invalid addresses and recipients who complain.
Mail server security
Email is the most common entry point for cyberattacks, so mail server security should be handled in several layers:
- Inbound filtering: Advanced anti-spam filters unwanted mail using SPF, Bayesian, reverse DNS and RBL checks, while virus and phishing protection blocks malicious attachments and fake links.
- Sender authentication: Always configure SPF, DKIM and DMARC for your domain. These records stop spoofing and improve inbox placement for your bulk sends. See our SPF, DKIM and DMARC guide for details.
- Encrypted connections: Use SSL/TLS for IMAP, POP3 and SMTP (ports 993, 995, 465/587). A DV SSL certificate is a basic requirement for webmail and your company website.
- Account security: Enforce a strong password policy, close or hand over leavers' accounts immediately and monitor suspicious login attempts.
- Bulk sending hygiene: Only send to opt-in lists, include an unsubscribe link and remove bounced addresses. Otherwise your server IP may be blocklisted, affecting email for the whole company.
On the infrastructure side, our servers run in a Tier III certified data center with redundant power and network connectivity.
Backup and data continuity
On a mail server, backups protect against two different risks: infrastructure-related data loss and user error (accidentally deleted folders, compromised accounts). A solid backup strategy follows these principles:
- Regular backups: Mailboxes should be backed up periodically, with backups kept separate from the server.
- The 3-2-1 rule: For critical data, keep at least three copies, on two different media, with one copy in a different location.
- Restore testing: You only know a backup works when you restore it; periodically try restoring a sample mailbox.
- Retention policy: Define an archive policy in line with your legal obligations and KVKK (Turkish Personal Data Protection Law) retention periods.
For critical correspondence, we also recommend keeping your own backups (for example an Outlook archive or a separate backup solution). Our support team can tell you more about backup options and restore procedures.
Mail server pricing in 2026
Our mail server plans are priced monthly in USD. Prices exclude VAT (October 2026). Every plan includes unlimited email accounts, bulk sending, MAPI/ActiveSync, Zimbra compatibility, advanced anti-spam and a free migration guarantee.
| Plan | Monthly price | NVMe storage | CPU | RAM | Best for |
|---|---|---|---|---|---|
| Mail Server 250 | $19.99 | 250 GB | 4 cores | 4 GB | SMBs |
| Mail Server 500 | $29.99 | 500 GB | 4 cores | 6 GB | Growing companies |
| Mail Server 750 (most popular) | $39.99 | 750 GB | 6 cores | 8 GB | Mid-size and large teams |
| Mail Server 1000 | $52.99 | 1000 GB | 8 cores | 12 GB | Enterprise scale |
Because accounts are unlimited, your cost per user falls as your team grows. For example, a company running 100 users on Mail Server 500 pays roughly $0.30 per user per month. You can switch the site currency to TRY to see prices at the current exchange rate. For a comparison with shared plans, read our business email pricing 2026 article.
Migrating from your current server
Every mail server plan comes with a free migration guarantee. Whether your current provider is shared hosting, Yandex or a server you set up yourself, our IMAP migration tool transfers every folder and message to the new server with your folder structure intact. The old system keeps running during the migration, the MX record is switched at a planned time, and any mail that arrives during the cutover is moved in a final sync. Your team switches to the new server without downtime.
Mail server checklist
- How many users do you have today, and how many will you have in 12–24 months?
- What is the average mailbox size, and how fast is your archive growing?
- Do you need bulk sending, and are your mailing lists opt-in?
- Do you need Exchange-like (MAPI/ActiveSync) sync on Outlook and mobile devices?
- Which certification does the data center hold, and where is your data stored?
- Can resources (CPU, RAM, disk) be increased easily as you grow?
- Are migration, setup and technical support charged separately?
Your answers will lead you to the right plan. For a small number of users and low sending volume, our business email plans fit best; for many users, bulk sending and Exchange-like sync, a business mail server is the most efficient solution. If you do not have a domain yet, start with a domain search, and read What is business email? for the fundamentals.