--- title: Atomic Mail canonical: https://saasranked.com/software/atomic-mail/ category: Encrypted Email Services points: 47 rank: 5 of 9 facts_checked: 2026-10-08 --- # Atomic Mail Encrypted mailbox with a free plan, unlimited storage and sign-up without a phone number. 47 points out of 100. #5 of 9 encrypted email services. Vendor: Atomic Mail. Website: https://atomicmail.io/ - The free plan includes end-to-end and zero-access encryption, unlimited storage and 10 aliases [1]. - Plus costs $5 a month on yearly billing and $7 a month billed monthly [1]. - 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 Linux [5]. - IMAP, SMTP and POP3 are not supported yet; the vendor plans to add them later in 2026 [4]. Verdict: 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. Status: The vendor's site shows a notice that Atomic Mail is undergoing emergency maintenance and some services may be unavailable [1]. ## Points | Criterion | Line | Value | Points | Note | |---|---|---|---|---| | Encryption | Stored mail the provider cannot read | Yes | 10/10 | Keys are made on your device. Zero-access applies to messages you encrypt end-to-end; others are protected in transit [3][8]. | | Encryption | Automatic end-to-end encryption between its own users | Yes | 8/8 | Sender picks Atomic Encryption (ECIES); keys are managed on the device. One vendor page also calls it default [1][7]. | | Encryption | Encrypted mail to other providers | Yes | 6/6 | "Encrypt by Password" or "Encrypt as File" lets you send to other providers; whitepaper describes AES-256 with a password-derived key [1][3]. | | Encryption | Encrypted contacts or calendar | Not published | 0/3 | Not published on the vendor's security whitepaper [3]; contacts and calendar encryption is not addressed. | | Trust and audits | Independent audit since 2024 | No | 0/8 | The vendor says third-party experts audit it but names no firm or date, which does not count [3][4]. | | Trust and audits | Open-source apps | Not published | 0/6 | Not published on the vendor's whitepaper [3] or support page [4]. | | Trust and audits | SOC 2 Type II or ISO 27001 | Not published | 0/4 | Only its data centres are described as ISO 27001 certified; no company or product certification is named [6]. | | Trust and audits | Transparency report | Not published | 0/4 | Not published on the vendor's whitepaper [3] or support page [4]. | | Trust and audits | Security key for two-factor sign-in | Not published | 0/4 | Not published on the vendor's support page [4]: two-factor authentication is supported, security keys are not mentioned. | | Apps and access | Official apps | Windows, macOS, iOS, Android | 8/10 | Download page lists apps for iOS, Android, macOS and Windows with no beta label; no Linux app [5]. | | Apps and access | Works in standard mail programs | No | 0/8 | Support FAQ says it does not support IMAP, SMTP or POP3 yet; planned for later in 2026 [4]. | | Mailbox | Your own domain | No | 0/5 | Custom domains are offered only on Business plans (from $3 per user a month), not on Free or Plus [1]. | | Mailbox | Mail storage on the cheapest paid plan | 999 | 5/5 | Free plan has unlimited storage and Plus includes everything in Free; counted as 999 GB for unlimited [1]. | | Mailbox | Export your whole mailbox | Not published | 0/3 | Not published on the vendor's support page [4]; the whitepaper says only that users can export their data [3]. | | Price | Free plan with an encrypted mailbox | Yes | 6/6 | Free plan with an encrypted mailbox and unlimited storage [1]. | | Price | Cheapest paid plan | $5/mo | 4/10 | Plus on yearly billing, $5 a month on the pricing page; launch post said $4.99 [1][2]. | ## Plans | Plan | Price | Per month (USD) | |---|---|---| | Free | Free [1] | $0 | | Plus (yearly) | $5/month [1] | $5 | | Plus (monthly) | $7/month [1] | $7 | 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 aliases [1]. - 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 file [1]. - Official apps for Windows, macOS, iOS and Android [5]. - Sign-up needs no phone number [1]. ## Limits - No IMAP, SMTP or POP3 yet, so third-party mail programs cannot connect [4]. - Custom domains are sold only on Business plans, not on Free or Plus [1]. - The vendor says it is audited by outside experts but names no firm or date [3][4]. - No Linux app is listed [5]. - A notice on the site says emergency maintenance may make some services unavailable [1]. ## Vendor claims (not scored) - Atomic Mail says it undergoes regular audits by independent third-party security experts [4]. ## Sources 1. [Atomic Mail pricing](https://atomicmail.io/pricing), Atomic Mail, accessed 2026-10-08 2. [Introducing Atomic Mail Plus](https://atomicmail.io/blog/introducing-atomic-mail-plus-more-privacy-less-hassle), Atomic Mail, accessed 2026-10-08 3. [Atomic Mail security whitepaper](https://atomicmail.io/security-whitepaper), Atomic Mail, accessed 2026-10-08 4. [Atomic Mail support](https://atomicmail.io/support), Atomic Mail, accessed 2026-10-08 5. [Download Atomic Mail](https://atomicmail.io/download), Atomic Mail, accessed 2026-10-08 6. [About Atomic Mail](https://atomicmail.io/about-us), Atomic Mail, accessed 2026-10-08 7. [End-to-end encryption](https://atomicmail.io/end-to-end-encryption), Atomic Mail, accessed 2026-10-08 8. [Zero-access encryption](https://atomicmail.io/blog/zero-access-encryption), Atomic Mail, accessed 2026-10-08