Aster Mail

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Score7.6

Rank#1 of 29

From$2.42/mo

Free planYes

Runs onAndroid, iOS, Linux, macOS, Web, Windows

SourceOpen source

Summary

Aster Mail is an open-source email service with a free plan and paid tiers. It supports web, desktop, and Android, with an iOS beta available through TestFlight; native desktop apps are available for Windows, Mac, and Linux. Aster Bridge connects desktop email apps using IMAP and SMTP. Email between Aster accounts is end-to-end encrypted automatically and uses hybrid post-quantum encryption. The free plan includes 10 GB of encrypted storage, five aliases, one custom domain, two mail rules, and attachments up to 25 MB per message, with no trial requirement or credit card needed. Aster says its mail is hosted in Germany under EU privacy law and that it uses no ads, inbox scanning, or AI on the inbox. QuickSwitch imports from Gmail, Outlook, Yahoo, Proton, and other IMAP providers; mailbox export in MBOX format is free on every plan. Paid plans start at 2.42 USD per month, billed annually, with the final amount determined at checkout.

Who it is for

Aster Mail may suit people seeking an open-source email service with encrypted mail between Aster accounts and desktop mail app access. It also has import options for users moving from named providers or other IMAP services.

What is good

Free plan includes 10 GB encrypted storage.
Free plan includes one custom domain and five aliases.
Desktop Bridge supports IMAP and SMTP apps.
MBOX mailbox export is free on every plan.
No trial or credit card is required for the free tier.

What to know first

iOS availability is beta on TestFlight.
Free attachments are limited to 25 MB per message.
Paid plan final amount is determined at checkout.
The first paid plan's refund guarantee excludes renewals.

Verdict

Aster Mail combines encrypted account-to-account email with desktop app connectivity, import, and export options. Its free storage and feature limits are clear, while paid users should note annual billing and the checkout-determined final amount.

Aster Mail plans and pricing

All plans

Free Free 10 GB encrypted storage · 5 email aliases · 1 custom domain · End-to-end encryption · Aster Bridge access astermail.org · 28 Sept 2026

Star $2.42/mo billed annually 50 GB encrypted storage · 15 email aliases · 5 custom domains · Unlimited mail rules · Aster Bridge access astermail.org · 28 Sept 2026

Nova $7.25/mo billed annually 500 GB encrypted storage · Unlimited email aliases · 30 custom domains · Unlimited mail rules · Aster Bridge access astermail.org · 28 Sept 2026

Supernova $14.50/mo billed annually 5 TB encrypted storage · Unlimited email aliases · Unlimited custom domains · Unlimited mail rules · Dedicated support astermail.org · 28 Sept 2026

Compared on private email services

Free plan: Yesastermail.org
Paid from: $2.42/user/moastermail.org
End-to-end encryption: Yesastermail.org
Custom domain: Yesastermail.org
Mailbox storage: 50 GBastermail.org
Email aliases: 15 aliasesastermail.org
Encrypted calendar: Noastermail.org
Mail protocol support: bridgeastermail.org

Facts

Free plan: Yesastermail.org · 15 Sept 2026
Paid from: 2.42astermail.org · 15 Sept 2026
End-to-end encryption: Yesastermail.org · 15 Sept 2026
Custom domain: Yesastermail.org · 15 Sept 2026
Mailbox storage: 50astermail.org · 15 Sept 2026
Email aliases: 15astermail.org · 15 Sept 2026
Encrypted calendar: Noastermail.org · 15 Sept 2026
Mail protocol support: bridgeastermail.org · 15 Sept 2026
Free storage: The free plan includes 10 GB of encrypted storage.astermail.org · 28 Sept 2026
Free aliases: The free plan includes 5 email aliases.astermail.org · 28 Sept 2026
Free domain: The free plan includes 1 custom domain.astermail.org · 28 Sept 2026
Free attachments: The free plan allows attachments up to 25 MB per message.astermail.org · 28 Sept 2026
Free mail rules: The free plan includes 2 mail rules.astermail.org · 28 Sept 2026
Trial policy: The free tier has no trial requirement and does not require a credit card.astermail.org · 28 Sept 2026
Refund policy: The first paid plan has a 30-day money-back guarantee; renewals are excluded.astermail.org · 28 Sept 2026
Supported platforms: Aster supports web, desktop, Android, and an iOS beta on TestFlight.astermail.org · 28 Sept 2026
Desktop apps: Native desktop apps are available for Windows, Mac, and Linux.astermail.org · 28 Sept 2026
Mail app bridge: Aster Bridge supports desktop IMAP and SMTP mail apps.astermail.org · 28 Sept 2026
Email encryption: Mail between Aster accounts is end-to-end encrypted automatically.astermail.org · 28 Sept 2026
Quantum-safe encryption: Mail between Aster accounts uses hybrid post-quantum encryption.astermail.org · 28 Sept 2026
Open source: Aster apps and its cryptography library are open source under AGPL-3.0.astermail.org · 28 Sept 2026
Hosting location: Aster says its email is hosted in Germany under EU privacy law.astermail.org · 28 Sept 2026
No inbox scanning: Aster says it has no ads, scanning, or AI on the inbox.astermail.org · 28 Sept 2026
Email migration: QuickSwitch imports mail from Gmail, Outlook, Yahoo, Proton, and other IMAP providers.astermail.org · 28 Sept 2026
Mailbox export: One-click mailbox export is free on every plan and uses the MBOX format.astermail.org · 28 Sept 2026
Company funding: Aster says it has no VC investors and is independent.astermail.org · 28 Sept 2026