KoltrixWhat Business Email Really Costs a Five-Person Startup
Mailboxes are only one line on the bill. A framework for adding up what email really costs a five-person startup, including sending, support tools and time.
On this page(10 sections)
Ask a founder what email costs and they'll usually quote the per-user price of their mailbox provider. That number is real, but it's often less than half the story. By the time a five-person startup has a product that sends email, a support address, and a newsletter, email is several line items, plus hours that never appear on an invoice.
This post gives you a framework to add it all up. We don't quote other vendors' prices, because they change and a stale number here would be wrong. Plug in current numbers from each vendor's pricing page.
The five cost components
Most startups pay for some combination of these:
| Component | What it covers | Typical pricing model |
|---|---|---|
| Mailboxes | Personal addresses for each team member | Per user, per month |
| Shared addresses | support@, billing@, hello@ |
Often an extra user license each, or included |
| App sending | Transactional email from your product | Per email volume tier |
| Support tooling | Help desk or shared inbox product | Per agent, per month |
| Marketing email | Newsletters and announcements | Per contact count |
Then there's the cost that doesn't appear on any bill: time.
Component 1: mailboxes
The obvious one. For five people, it's five times the per-user price of your provider. But check two things:
Do shared addresses cost a license? With some providers, a shared mailbox like support@ is free; with others, the simplest way to get a mailbox several people can read is to buy another user license. Five people plus three shared addresses can mean paying for eight users.
What's bundled? If you also use the provider's documents, calendar and video calls, part of that per-user price pays for those. That's a fair reason to pay it. If you only use email, you may be paying for a suite you don't need.
Component 2: app sending
If your product sends password resets, receipts or notifications, you're probably using a transactional email API. Pricing is usually by monthly volume, with tiers.
To estimate, count emails per active user per month, multiply by active users, and add headroom for growth. We go through this in detail in estimating transactional email costs as you grow.
For a five-person startup with a young product, this line is often small. It grows with your user base, not your team.
Component 3: support tooling
If you've moved beyond a shared mailbox to a help desk or collaborative inbox, there's usually a per-agent charge. Count everyone who needs to reply, including founders who jump in occasionally, since some tools charge for them too.
Component 4: marketing email
Newsletter and campaign tools typically charge by contact count. The awkward property of this model is that the bill grows as your list grows, whether or not you email those contacts often. Prune inactive contacts and the cost drops.
Component 5: time
This is the hidden one, and for a small team it can be the largest.
- Setup. DNS records for each vendor: SPF entries, DKIM keys, verification records. Each tool adds its own.
- Maintenance. Keeping SPF under its DNS lookup limit as you add senders, rotating keys, fixing records after a website migration.
- Context switching. Product replies in one place, support in another, newsletter replies in a third.
- Onboarding and offboarding. Every new hire needs accounts in several tools; every departure needs them closed.
Put an honest hourly value on founder or engineer time and estimate hours per month. Even two or three hours a month adds up over a year.
A worksheet you can copy
| Line item | Quantity | Unit price | Monthly cost |
|---|---|---|---|
| Mailbox licenses | 5 users | (your provider) | |
| Extra licenses for shared addresses | 3 | (your provider) | |
| Transactional email API | (emails/month) | (tier) | |
| Help desk or shared inbox tool | (agents) | (your vendor) | |
| Newsletter tool | (contacts) | (tier) | |
| Domain and DNS | 1 | (registrar) | |
| Time: setup and maintenance | (hours) | (your hourly value) | |
| Total |
Fill it in honestly and compare the total with what you thought email cost.
A worked example with Koltrix
Here's how the same five-person company might look on Koltrix, using the prices in our own published plans at the time of writing. Koltrix combines the team inbox, shared mailboxes and the transactional API in one workspace, priced per workspace rather than per user.
- Starter is $12 per month (or $115 per year) and includes 3 seats. Each extra seat is $4 per month. For five people, that's $12 + 2 × $4 = $20 per month. It includes 2 domains, 10 addresses (enough for personal and shared addresses), 10 GB of storage, 500 inbox sends a day and 10,000 API sends a month.
- Pro is $39 per month (or $374 per year) and includes 10 seats, 10 domains, 50 addresses, 50 GB, 2,000 inbox sends a day and 50,000 API sends a month, with additional API sends at $1 per 1,000.
What Koltrix doesn't replace: an office suite (documents, spreadsheets, calendar, video), a full help desk with SLAs and multi-channel queues, or a newsletter tool, since campaigns aren't in v1. If you need those, they stay on the worksheet. Current prices are always on our pricing page.
How to reduce the total
- Count your shared-address licenses. If you're buying user licenses just to share an address, look for a tool with real shared mailboxes.
- Prune newsletter lists. Contacts who haven't engaged in a year cost money under per-contact pricing.
- Consolidate DNS-heavy vendors if setup and maintenance time is significant, but only where the replacement does the job equally well. Our post on hidden costs in a multi-vendor email stack covers the trade-offs.
- Review annually. Annual billing is usually cheaper, but only commit once you know the tool fits.
Key takeaways
- Mailbox licenses are only one line; add app sending, support tools, marketing email and time.
- Check whether shared addresses cost an extra license with your provider.
- Use current prices from each vendor's site, and fill in an honest worksheet.
- Some costs are structural, like paying per contact or per user. Choose pricing models that grow with what you actually use.
Start with Koltrix
Your domain, one inbox, and an API that sends.
A team inbox where AI sorts and drafts (nothing is sent without your click), plus the transactional API and SMTP relay your product sends with. 7 days free, no card.
