The Proton Mail alternative with post-quantum on by default
Looking for a Proton Mail alternative? Secria Mail seals every message in your mailbox with post-quantum encryption from your first sign-in, on every plan, free included. There is no setting to find. In Proton Mail, post-quantum protection is something you enable in your account settings. Secria Pro puts mail and the VPN in one plan.
- Post-quantum on every plan
- Free plan, no card required
- Mail and VPN in one plan
Why people look elsewhere
Four things Proton Mail does differently
Taken from Proton’s own support and pricing pages. Every point links to its source.
Post-quantum mail is a setting
Proton’s support page lists the steps: open your account settings, select Encryption and keys, and click Enable post-quantum protection.1
It covers new mail only
Proton says its post-quantum protection “does not retroactively re-encrypt emails that are already in your mailbox, for now.”1
One custom domain on Mail Plus
Proton lists Mail Plus with 15 GB of storage and support for 1 custom email domain.2 Secria Mail Plus has 20 GB and 3 custom domains.
The VPN sits in a bigger plan
Proton’s pricing page lists its VPN under Proton Unlimited, not under Mail Plus.2
Proton Mail vs Secria Mail
Side by side, on the defaults and the paid mail plan
Every Proton cell links to Proton’s own pages.
| Question | Proton Mail | Secria Mail |
|---|---|---|
| Post-quantum encryption | A setting you enable in your account.1 | On by default on every plan, free included. |
| Mail already in your mailbox | Not re-encrypted when you enable it, for now.1 | Every message in your mailbox is sealed with a post-quantum key exchange. |
| Paid mail plan, monthly billing | Mail Plus, at a higher monthly price than Secria Mail Plus.2 | Mail Plus, $3.99/mo. |
| Storage and domains on that plan | 15 GB and 1 custom domain.2 | 20 GB and 3 custom domains. |
| Mail and VPN in one plan | Proton Unlimited, at a higher monthly price than Secria Pro.2 | Secria Pro, $9.99/mo. |
- Proton, How to enable post-quantum protection in Proton Mail (Proton Support).
- Proton, Proton Mail pricing: Mail Plus is listed with 15 GB storage and support for 1 custom email domain. On monthly billing, Mail Plus and Proton Unlimited are each listed above the Secria plan they are compared with here.
Checked October 11, 2026 against Proton’s own pages. Secria facts are from our Mail page, pricing and mail whitepaper.
What you get with Secria
An inbox that feels familiar, with protection already on
Simple
Folders, search, attachments and rich text, the way you are used to. Protection is on from your first message, with nothing to set up.
Private
No ads on any plan and no profiling. Tracking pixels are removed automatically, and senders never see your IP address. Aliases keep your main address to yourself.
Secure
Keys are made on your device. Every message in your mailbox is sealed with your keys. ML-KEM-1024 with X25519 on every plan, free included.
Integrated
Mail and the Secria VPN in one account with Secria Pro. Use your own domain on paid plans, on web, iPhone and Android.
Switching from Proton Mail
Bring your old mail. Move at your own pace.
Create your free account
Pick your Secria address in a minute. No card, no phone number. Save your recovery phrase when you sign up, because it is your way back in if you forget your password.
Bring your archive
Export your mail from your old mailbox, then import the MBOX or EML files. They are read and encrypted in your browser before upload.
Move over gradually
Keep your old address running while you tell people your new one. Make Secria your main inbox when you are ready.
Start free. Upgrade when you need more.
Every plan, including free, gets the same encryption.
Secria Pro
500 GB, unlimited aliases, 10 custom domains, and the full Secria VPN on 5 devices.
Monthly prices shown. Yearly and 2-year plans cost less per month. Compare all plans
30-day money-back on plans bought here. App Store and Google Play purchases follow their own refund rules.
Questions about switching from Proton Mail
Is post-quantum encryption on by default in Proton Mail?
Proton’s support page describes it as something you enable: you open your account settings, select Encryption and keys, and click Enable post-quantum protection. In Secria Mail it is on from your first sign-in, on every plan, with nothing to enable.
Is there a free Proton Mail alternative?
Yes. The free plan gives you 1 GB, 2 aliases, 3 folders, mail import and the same encryption as every paid plan. No card and no phone number.
How does Secria Mail Plus compare with Proton Mail Plus?
Secria Mail Plus is $3.99 a month on monthly billing, with 20 GB of storage and 3 custom domains. Proton’s pricing page lists Mail Plus at a higher price on monthly billing, with 15 GB of storage and 1 custom email domain.
Can I get encrypted mail and a VPN in one plan?
Yes. Secria Pro includes Secria Mail with 500 GB and the full Secria VPN on 5 devices, for $9.99 a month on monthly billing. Yearly and 2-year plans cost less per month.
Can I move my mail to Secria?
Yes. Secria imports MBOX files, EML files and Outlook PST files on every plan, free included. MBOX and EML files are read and encrypted in your browser before upload.
Which devices does Secria Mail work on?
The web, iPhone and Android. Your account, folders and aliases are the same on each.
Post-quantum from your first message.
Start free. Nothing to switch on.
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