Which is the better fit for email and office collaboration?

Proton Mail is the closer fit if a business also wants shared files, collaborative documents, spreadsheets, and video meetings. Those broader tools are part of Proton’s Workspace plans; Sekur concentrates on controlled email, messaging, and VPN access.

Can I buy encrypted email without the full suite?

Yes. Proton sells Mail Essentials for business email and calendar, while Sekur sells SekurMail separately from SekurMessenger and SekurVPN.

Which offers a dedicated private messenger?

Sekur offers SekurMessenger, with private group chats, encrypted text and voice messages, and self-destruct timers. Proton Mail’s listed business workspace tools do not include a comparable dedicated messenger.

Can either service use my business email domain?

Yes. Proton Mail Essentials includes three custom email domains, with higher allowances on Workspace plans. Sekur lists custom-domain support on its Operational and Command mail tiers.

Can I keep using Outlook or Apple Mail?

Proton Mail supports Outlook, Apple Mail, and Thunderbird through Proton Mail Bridge on eligible paid plans. Sekur does not publish a corresponding desktop email-client integration.

How do their VPN offerings differ?

Proton lists one VPN connection per Mail Essentials user and ten per Workspace user. Sekur lists five devices per VPN account and Swiss-only IP routing.

Which has more email storage?

Proton’s business plans list 15 GB per user on Mail Essentials, 1 TB on Workspace Standard, and 3 TB on Workspace Premium. SekurMail lists 150 GB on Private, 250 GB on Operational, and 500 GB on Command.

What are the entry prices for business email?

Proton lists Mail Essentials at $6.99 per user per month when billed yearly. Sekur lists SekurMail Private at $50 per user per month.

Proton Mail vs Sekur

Proton Mail suits teams that want encrypted business email within a broader productivity workspace; Sekur suits organizations that want email, private messaging, and VPN access in a tightly controlled Swiss-hosted environment. Both offer business email, but their plans emphasize different needs: Proton adds collaborative documents and meetings, while Sekur offers dedicated messaging and communication controls.

Last updated November 8, 2026.

At a glance

Proton Mail compared with Sekur, one row per dimension
Dimension	Proton Mail	Sekur
Broader offering	Mail, calendar, files, documents, meetings, VPN, and passwords	Mail, private messaging, and VPN
Private messaging	Not published	SekurMessenger with private groups and self-destruct timers
Email starting price	Mail Essentials: $6.99/user/month, billed yearly	SekurMail Private: $50/user/month
Suite starting price	Workspace Standard: $12.99/user/month, billed yearly	Private Bundle: $95/user/month
Email storage	15 GB to 3 TB per user, by plan	150 GB to 500 GB, by SekurMail tier
Custom domains	3 to 20 included, by business plan	Included with Operational and Command mail tiers
Desktop email clients	Outlook, Thunderbird, and Apple Mail via Bridge	Not published
File transfers	Secure file sharing through Proton Drive	Up to 5 GB with SekurMail
VPN allowance	1 or 10 connections per user, by plan	5 devices per account; Swiss IP only
Deployment	Proton-hosted services	Swiss-hosted; on-premise deployment offered
Support	Priority business support	Live chat, email, and knowledge base

Scroll the table sideways to compare each row.

Which should you choose?

Choose Proton Mail if

Teams replacing email and productivity tools together
Businesses using Outlook, Thunderbird, or Apple Mail
Organizations needing substantial storage per user
Teams that want listed annual per-user workspace pricing

See Proton Mail — 20% CASHBACK

Choose Sekur if

Teams needing private group messaging alongside email
Organizations prioritizing controlled external communications
Users requiring Swiss-only VPN routing
Businesses seeking SekurMail with administrative controls

See Sekur — 30% CASHBACK

The verdict

Pick Proton Mail when your team needs custom-domain email alongside shared files, documents, meetings, and familiar desktop email clients. Pick Sekur when controlled recipient access, private group messaging, and Swiss-only VPN routing matter more to your workflow. Compare the specific tiers you would buy: Proton’s Mail Essentials focuses on email and calendar, while its fuller workspace tools require a Workspace plan; Sekur sells mail separately or with Messenger and VPN.