Updated: 28 September 2026 · Applies to: Self-managed dedicated servers
If you send a lot of email, the price per message matters. Paid sending services charge by the volume or with credits. A dedicated server with a subnet (for example a /26 with 61 usable IPv4 addresses) has a fixed monthly cost, whatever you send. Which is cheaper depends on your volume and on how much work you can do yourself. This guide gives you a way to compare them with your own numbers, without guessing.
1. The formula
Take your monthly volume and calculate the cost for each option:
Server cost per month = server + subnet + (your time or support) Server cost per 1,000 = Server cost per month / (volume per month / 1,000) Service cost per 1,000 = price of a credit pack / (emails in the pack / 1,000) Service cost per month = Service cost per 1,000 x (volume per month / 1,000) Break-even volume = Server cost per month / Service cost per 1,000 x 1,000
Above the break-even volume the fixed cost of the server is lower than the per-message cost of the service. Below it, the service is cheaper.
2. Fill in your numbers
- Server: the price of your dedicated server plan in the store (Ucartz dedicated server locations, IP address rules and additional IP support lists the locations), plus the price of an additional subnet if you need one (ask in a ticket, How to order an additional IPv4 subnet for your dedicated server?). The store shows the current prices. Additional blocks are priced per month in the cart (September 2026, US dollars): /29 about 10 to 30, /28 60, /27 136, /26 172, /25 331 and /24 512 (How many IP addresses come with a dedicated server and what do additional subnets cost?). Unmanaged dedicated servers start from 74 per month; the plan you need may cost more.
- Your time or support: the hours you spend on setup, warm-up, monitoring and list handling. Value them at your own hourly cost, or at the price of Ucartz's on-demand server administration (billed per 15 minutes, per 30 minutes or per hour, with monthly plans available). Free Basic Managed Support covers quick tasks only, on a best-effort basis.
- Volume: messages per month, including transactional mail.
- Sending service price: from the price list of the service you compare, including the extras you need (dedicated IP addresses, extra domains, logs, support).
3. A worked example
The server and subnet prices below come from the Ucartz cart (September 2026). The support cost and the price of the sending service are only examples; replace them with your own numbers.
- Cheapest unmanaged dedicated server: 74 per month. Additional /26 block (61 usable IPv4): 172 per month. Together 246 per month.
- Your own estimate for setup, monitoring and list work, for example 40 per month. Total 286 per month.
- Break-even volume = 286 / (price per 1,000 messages) x 1,000. If a sending service charges 0.50 per 1,000 messages, the break-even is 572,000 messages a month. At 1.00 per 1,000 it is 286,000. At 2.00 per 1,000 it is 143,000.
- Below the break-even volume the service is cheaper. Above it, the server is cheaper. At 1.00 per 1,000 and 1,000,000 messages a month, the service costs 1,000 and the server 286.
- With a smaller block the server costs less: the same server with an additional /28 (13 usable IPv4, 60 per month) is 74 + 60 + 40 = 174 per month, and the break-even at 1.00 per 1,000 falls to 174,000 messages.
4. What a bigger subnet changes
A larger subnet does not send more mail by itself. It gives you more addresses to separate different streams (brands, customers or types of mail) and to grow into. How many addresses you need is a question of how many separate sending identities you have, not of volume (How many IP addresses do you need for your dedicated server?). A /26 gives room for 61 addresses; a /28 (13 addresses) is enough for many businesses. Do not buy more addresses than you can keep at steady volumes.
5. What the service includes and the server does not
- A service runs the mail servers for you and handles many of the technical details: authentication, bounce handling, reporting and often support.
- A server gives you full control, and the cost does not grow with the volume. It also makes you responsible for reputation, list handling and running the server.
Neither option guarantees that mail reaches the inbox. That depends on your lists, your content and your reputation. If you choose your own server, plan the work: Sending email from your own dedicated server: a checklist.
6. Other costs to include
- Backups of the server and of your lists.
- Monitoring (How to monitor your sending IP addresses automatically with a script?) and the time to react.
- Newsletter or list software (open-source options exist; consider the time to run them).
- Warm-up time: new addresses need weeks to reach full volume (How to warm up a new sending IP address step by step?).
Frequently asked questions
Can a dedicated server also do other work?
Yes. The same server can host websites and applications. That improves the comparison, because you use the server for more than mail.
Which server should I choose?
Look at CPU, RAM and disk for your list size and message volume, at the location, and at the number of addresses you need. Our team can advise, and you can start with a small block and add a bigger one later.
Need a dedicated server, more IP addresses, or a hand with the setup?
- Unmanaged dedicated servers: full root access and IPv4 subnets from /29 up to /24, ordered with the server or added later.
- Managed dedicated servers: our team looks after the operating system, updates, security and monitoring.
- Dedicated server locations: choose the country and data centre when you order.
Prefer a hand with the setup? Our engineers can do it for you: Hire an Expert, or use our on-demand server management.
