encrypted email service · Atomic Mail

Atomic Mail

Encrypted mailbox with a free plan, unlimited storage and sign-up without a phone number.

47/100

#5 of 9 encrypted email services
Facts checked 8 Oct 2026

The vendor's site shows a notice that Atomic Mail is undergoing emergency maintenance and some services may be unavailable¹.

In short

The free plan includes end-to-end and zero-access encryption, unlimited storage and 10 aliases¹.
Plus costs $5 a month on yearly billing and $7 a month billed monthly¹.
Mail to other Atomic users can be end-to-end encrypted with ECIES; mail to other providers can be locked with a password^1,7.
Apps exist for Windows, macOS, iOS and Android, but not Linux⁵.
IMAP, SMTP and POP3 are not supported yet; the vendor plans to add them later in 2026⁴.

Atomic Mail suits people who want a free encrypted mailbox they use only in its own apps and browser. Between its users the sender picks Atomic Encryption and handles no keys; external recipients get a password-protected message^1,7. The catch: no IMAP access yet, no custom domain on personal plans, and no named outside audit^3,4.

Best for: People who want a free encrypted mailbox and apps on four systems.

Where the points come from

Encryption24 of 27

Trust and audits0 of 26

Apps and access8 of 18

Mailbox5 of 13

Price10 of 16

Encryption 24 of 27 points

Rule	What is published	Points
Stored mail the provider cannot read	YesKeys are made on your device. Zero-access applies to messages you encrypt end-to-end; others are protected in transit^3,8.	10 / 10
Automatic end-to-end encryption between its own users	YesSender picks Atomic Encryption (ECIES); keys are managed on the device. One vendor page also calls it default^1,7.	8 / 8
Encrypted mail to other providers	Yes"Encrypt by Password" or "Encrypt as File" lets you send to other providers; whitepaper describes AES-256 with a password-derived key^1,3.	6 / 6
Encrypted contacts or calendar	Not publishedNot published on the vendor's security whitepaper³; contacts and calendar encryption is not addressed.	0 / 3

Trust and audits 0 of 26 points

Rule	What is published	Points
Independent audit since 2024	NoThe vendor says third-party experts audit it but names no firm or date, which does not count^3,4.	0 / 8
Open-source apps	Not publishedNot published on the vendor's whitepaper³ or support page⁴.	0 / 6
SOC 2 Type II or ISO 27001	Not publishedOnly its data centres are described as ISO 27001 certified; no company or product certification is named⁶.	0 / 4
Transparency report	Not publishedNot published on the vendor's whitepaper³ or support page⁴.	0 / 4
Security key for two-factor sign-in	Not publishedNot published on the vendor's support page⁴: two-factor authentication is supported, security keys are not mentioned.	0 / 4

Apps and access 8 of 18 points

Rule	What is published	Points
Official apps	Windows, macOS, iOS, AndroidDownload page lists apps for iOS, Android, macOS and Windows with no beta label; no Linux app⁵.	8 / 10
Works in standard mail programs	NoSupport FAQ says it does not support IMAP, SMTP or POP3 yet; planned for later in 2026⁴.	0 / 8

Mailbox 5 of 13 points

Rule	What is published	Points
Your own domain	NoCustom domains are offered only on Business plans (from $3 per user a month), not on Free or Plus¹.	0 / 5
Mail storage on the cheapest paid plan	999Free plan has unlimited storage and Plus includes everything in Free; counted as 999 GB for unlimited¹.	5 / 5
Export your whole mailbox	Not publishedNot published on the vendor's support page⁴; the whitepaper says only that users can export their data³.	0 / 3

Price 10 of 16 points

Rule	What is published	Points
Free plan with an encrypted mailbox	YesFree plan with an encrypted mailbox and unlimited storage¹.	6 / 6
Cheapest paid plan	$5/moPlus on yearly billing, $5 a month on the pricing page; launch post said $4.99^1,2.	4 / 10

The rule behind each line: how we score encrypted email services.

Plans and prices

As the vendor lists them, before tax. Prices are in US dollars unless the plan shows euros; the points use US dollars, with euros converted at the ECB rate.

Plan	Price as listed	Per month	Notes
Free1 person	Free¹	$0	Encrypted mailbox, unlimited storage, 10 aliases
Plus (yearly)1 person	$5/month¹	$5	Adds 15 aliases, Hide My Email and AI tools; shown as 20% off monthly
Plus (monthly)1 person	$7/month¹	$7	Same features, billed monthly

The pricing page shows Plus as "From $5 per month", with $5 on yearly billing and $7 on monthly billing. The launch post from December 2025 gave $4.99 and $5.99^1,2.

Strengths

The free plan has end-to-end encryption, unlimited storage and 10 aliases¹.
Messages to Atomic users use ECIES encryption, with keys managed on the device and no keys for the sender to handle^1,7.
Messages to other providers can be locked with a password or sent as an encrypted file¹.
Official apps for Windows, macOS, iOS and Android⁵.
Sign-up needs no phone number¹.

Limits

No IMAP, SMTP or POP3 yet, so third-party mail programs cannot connect⁴.
Custom domains are sold only on Business plans, not on Free or Plus¹.
The vendor says it is audited by outside experts but names no firm or date^3,4.
No Linux app is listed⁵.
A notice on the site says emergency maintenance may make some services unavailable¹.

What Atomic Mail says

Vendor claims. We show them, but they earn no points.

Atomic Mail says it undergoes regular audits by independent third-party security experts⁴.

Other encrypted email services

1
Proton MailPeople who want a free encrypted mailbox that grows into a paid one with custom domains and Outlook or Thunderbird access
85/100
$3.99/mocheapest paid plan
2
Tuta MailPeople who want contacts and calendar encrypted too, and are fine using Tuta's own apps instead of a mail program
73/100
$3.36/mocheapest paid plan
3
Forward EmailPeople with their own domain who want IMAP access and a low price
56/100
$3/mocheapest paid plan
4
mailbox.orgPeople who want to read their mail in Thunderbird or Outlook and switch on encryption themselves
49/100
$1.12/mocheapest paid plan

All 9 encrypted email services

Sources

Atomic Mail pricing, Atomic Mail. Accessed 8 Oct 2026.
Introducing Atomic Mail Plus, Atomic Mail. Accessed 8 Oct 2026.
Atomic Mail security whitepaper, Atomic Mail. Accessed 8 Oct 2026.
Atomic Mail support, Atomic Mail. Accessed 8 Oct 2026.
Download Atomic Mail, Atomic Mail. Accessed 8 Oct 2026.
About Atomic Mail, Atomic Mail. Accessed 8 Oct 2026.
End-to-end encryption, Atomic Mail. Accessed 8 Oct 2026.
Zero-access encryption, Atomic Mail. Accessed 8 Oct 2026.

Website: atomicmail.io · Markdown version · We are not affiliated with Atomic Mail.