Big Mail is a next-generation email client from The Not So Big Company, positioned as “Smart, Fast, Private” and built for iOS and macOS. It is not an email delivery provider or an email marketing platform, but a client that connects to your existing mailboxes via IMAP/SMTP. It supports modern email providers such as Gmail, Yahoo, iCloud, Outlook, Microsoft 365, and Fastmail.
For email management, Big Mail centers on Smartboxes: email “playlists” that can combine real-time filters to group project conversations, orders, newsletters, and more. Layouts offer different reading views such as Timeline and Gallery, while Quick Actions enable one-tap bulk archiving or handling of read and replied-to emails. It also supports Gmail labels and extends label-like functionality to mailboxes that do not natively support labels.
Privacy is its main selling point. Big Mail says emails connect directly from the device to the email provider, rather than being stored on its own servers as with some clients. Private Push Relay uses IMAP idling to listen for new-message events and only sees the “EXISTS” response, then wakes the device to fetch the content locally. As a result, neither Big Mail’s servers nor Apple’s push notification service are exposed to email bodies or sender information. Secret Sync uses locally generated message hashes to sync data such as Notes and Reply Later.
Big Mail has officially confirmed that it will be subscription-only, with no one-time purchase option. Pricing has not yet been announced. Big Mail Online is optional, but features such as push notifications and Auto Reply require an account. On the integration side, it mainly relies on IMAP/SMTP, and the team plans to open-source SwiftIMAP, SwiftSMTP, and SwiftEmail at the official launch, which adds a degree of transparency.
Its strengths are a clear privacy architecture, support for multiple mailboxes, and rich email organization features. It is well suited to Apple device users, people with high email volume, and users who care about local control. The downside is that it is still in TestFlight, and the source text notes that the iPhone app is currently the main focus of testing. There is also no public data yet on the stability of the official release, subscription pricing, or support responsiveness. The jurisdiction field in the terms of service is still a placeholder, which also makes the product feel not fully mature.
Access from mainland China cannot be confirmed from the source text, so it should be considered unknown. Since it depends on the App Store/TestFlight, overseas email services, and Big Mail Online, the actual experience may be affected by the network environment, email provider connectivity, and available payment methods. If you need a more predictable option for use in China, consider Apple Mail, Outlook, the Gmail client, or official apps from domestic email providers.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on bigmail.app official site.
bigmail.app is an Unknown Comms & Email provider. TG4G tracks its product information, an overall rating of 6.0/10, and a China-accessibility score of Workable. Click "Visit Official Site" to reach bigmail.app directly.