KoltrixHow to Choose a Business Email Provider: A Practical Scorecard
Picking a business email provider is mostly a question of which trade-offs you can live with. A weighted scorecard you can copy, with the criteria that matter.
On this page(9 sections)
Most companies choose their email provider by default: whoever the founder already used, or whatever came bundled with something else. That works until it doesn't, and changing providers later is a real project. If you're choosing deliberately, a simple weighted scorecard keeps the decision about your needs rather than about which vendor has the best landing page.
Why a scorecard
Email providers look similar from a distance. They all host mailboxes on your domain, filter spam and have a web app. The differences show up in specific places: whether your team's preferred mail client works, how shared addresses are handled, whether your product's email can live in the same system, where data is stored, and what leaving looks like.
A scorecard forces you to decide which of those matter to you before you look at vendors, so a slick demo doesn't reorder your priorities.
Step 1: Pick your criteria
Here are the criteria most small and mid-sized teams care about. Drop the ones that don't apply and add any that are specific to you.
Daily use
- Mail clients supported. Web only, or IMAP/SMTP for Outlook, Apple Mail and phone apps? Native mobile apps?
- Search quality. How quickly can someone find a two-year-old thread?
- Spam filtering. Strong filtering is the feature you notice only when it's missing.
- Speed and reliability of the web interface.
Team workflow
- Shared addresses. Can several people work
support@together with visibility into who replied, or is it just a group that forwards copies? - Permissions. Per-person access to shared mailboxes, admin roles, delegation.
- Collaboration features. Internal notes, assignment, labels and rules.
Product email
- Application sending. If your software sends email, can it go through the same provider, via an API or SMTP relay, or do you need a separate service?
- Reply handling. When customers reply to your product's emails, where do the replies go?
Admin and security
- Two-factor authentication and the ability to require it.
- Admin controls: user lifecycle, audit logs, recovery.
- Domain setup. How much help do you get with SPF, DKIM and DMARC?
Data and compliance
- Data location. Which country or region your mail is stored in.
- Subprocessors. Which other companies touch your data, including AI providers.
- Certifications. If your customers' security questionnaires require SOC 2, ISO 27001 or similar, this may be a hard requirement.
Commercials and exit
- Pricing model. Per user, per workspace, per volume.
- Bundled tools. Calendar, documents, video calls. Valuable if you need them, overhead if you don't.
- Exit path. Can you export everything in a standard format? How hard is it to leave?
Step 2: Weight them
Give each criterion a weight from 1 (nice to have) to 5 (critical). Be honest. A team where everyone lives in Outlook desktop should weight mail client support at 5. A team that works entirely in the browser might give it a 1.
If anything is a true dealbreaker, mark it separately. A provider that fails a dealbreaker is out, regardless of total score.
Step 3: Score each provider
Score each provider from 0 to 3 on each criterion:
- 0: not available
- 1: available but weak
- 2: good
- 3: excellent for your needs
Multiply score by weight and add up the totals.
A scorecard to copy
| Criterion | Weight (1–5) | Provider A | Provider B | Provider C |
|---|---|---|---|---|
| Desktop and mobile clients (IMAP/native apps) | ||||
| Search quality | ||||
| Spam filtering | ||||
| Shared addresses with team visibility | ||||
| Per-person mailbox permissions | ||||
| Application sending (API/SMTP) | ||||
| Replies to product email reach a person | ||||
| Guided SPF/DKIM/DMARC setup | ||||
| 2FA and admin controls | ||||
| Data location fits our needs | ||||
| Required certifications | ||||
| Office suite included (if needed) | ||||
| Pricing model fits team shape | ||||
| Clean export and exit path | ||||
| Weighted total |
Step 4: Test the top two
Scores narrow the field; a trial makes the decision. Pick your top two and spend a few days with each, using a test domain or subdomain:
- Set up the domain and see how clear the DNS steps are.
- Send and receive real mail with Gmail, Outlook and Yahoo accounts.
- Have two people work a shared address at the same time.
- If your app sends email, send a password reset through it.
- Export a mailbox and check you can open the result.
Our guide to evaluating an email tool in a week-long trial has a day-by-day plan.
How common providers tend to score
Without assigning numbers, the broad patterns are well known:
- Google Workspace and Microsoft 365 score highly on clients, spam filtering, certifications and bundled office tools. They don't include a sending API for your product, and shared-inbox workflows are basic without add-ons.
- Zoho Mail scores well on price and suite breadth, and supports standard protocols.
- Fastmail scores highly on speed, search and standards support. Proton Mail scores highly on encryption and privacy.
- Koltrix scores well on shared addresses with per-person permissions, application sending on the same domain, replies to product email landing in the team inbox, and guided DNS setup with live checks. It's a web app with no IMAP access and no SOC 2 or ISO certification in its first release, so it scores 0 on those rows. Its comparison with Google Workspace lays out both sides.
Your weights decide which of these profiles wins.
Common mistakes
- Weighting everything a 5. Then nothing is a priority. Force yourself to have some 1s and 2s.
- Ignoring the exit path. Every provider is easy to join. Check how hard it is to leave.
- Forgetting product email. If your app sends email, that system has to coexist with your mailboxes, on the same domain and the same DNS.
- Choosing for today's team size only. Run the pricing at your current size and at three times that.
Bottom line
A scorecard won't make the decision for you, but it stops you from making it for the wrong reasons. List the criteria that matter, weight them honestly, mark dealbreakers, score your candidates, and test the top two with real mail. The provider that wins on your weights is the right one, even if it isn't the most popular.
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.
