4SecureMail vs Aster Mail

4SecureMail provides secure email accounts and managed email hosting for businesses and consumers. Accounts support POP, IMAP, and SMTP with SSL/TLS and work with standard clients such as Outlook and Thunderbird. SecureVault encrypts sensitive outgoing email for outside recipients, who read and reply through a secure web link. Spam protection includes SpamAssassin and a challenge/response whitelist; a server-based ICSA-certified virus scanner is also included. The FAQ says SSL/TLS sessions begin before login credentials are exchanged, and that TLS 1.2 and Perfect Forward Secrecy are supported. The company describes support for HIPAA, GLB, and SOX, can provide or review a Business Associate Agreement, and offers off-site legal archiving at additional cost. IMAP IDLE notifications and simultaneous connections from multiple devices are supported. Outgoing attachments can total up to 5 GB across all recipients. Plans range from one mailbox with 500 MB of storage and no custom domain to options with multiple mailboxes, more storage, and custom domains. The service has no free plan but offers a free trial; listed pricing starts at $8.24/mo. It is available worldwide to holders of major credit cards and supports U.S. currency.

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 on TestFlight; native desktop apps are available for Windows, Mac, and Linux. Aster Bridge lets desktop mail apps connect over IMAP and SMTP. Mail between Aster accounts is automatically end-to-end encrypted and uses hybrid post-quantum encryption. The free plan costs nothing and includes 10 GB of encrypted storage, five aliases, one custom domain, two mail rules, attachments up to 25 MB per message, and Bridge access; no trial or credit card is required. Aster says its email is hosted in Germany under EU privacy law and that it does not use ads, inbox scanning, or AI on the inbox. QuickSwitch imports mail from Gmail, Outlook, Yahoo, Proton, and other IMAP providers. MBOX mailbox export is free on every plan. Paid plans start at $2.42 a month, billed annually, with the final amount determined at checkout. Aster Mail was founded in 2026 and is headquartered in Orlando, Florida, United States.