System requirements
YouniqMail runs on macOS, Windows and Linux, as a native application, not in the browser. All builds come from the same source and carry the same version number.
Operating systems
Section titled “Operating systems”Supported are:
| System | Supported |
|---|---|
| macOS | version 12 (Monterey) and later; Apple Silicon only |
| Windows | Windows 10 and 11, 64 bit (x64), as an installer |
| Linux | Ubuntu 22.04, Debian 12, Fedora 35, RHEL 9, openSUSE Leap 15.6 and comparable, or later (glibc 2.34 or newer); as AppImage, .deb and .rpm for x64 and ARM64 |
The AppImage needs FUSE, which most desktop systems ship with.
When a system version reaches its end of life with its maker, support in YouniqMail foreseeably ends too. A current system is the foundation of safe emailing anyway.
Disk space
Section titled “Disk space”The app itself is content with a few hundred megabytes. What matters is room for your mailboxes: YouniqMail loads mail into a local database. That makes search and daily work fast and offline-capable. It loads attachments only when you open them and keeps at most about 500 MB of them on hand; mail in local folders, on the other hand, lives entirely on your computer, attachments included.
As a reference point: a mailbox of 50,000 emails usually needs a few gigabytes. Add working room for the database. Scarce disk space shows up as sluggishness before it becomes an error.
Memory
Section titled “Memory”8 GB of total memory is a sensible floor for fluid work next to a browser and office apps. YouniqMail itself typically occupies a few hundred megabytes across several processes.
Network
Section titled “Network”YouniqMail speaks IMAP and SMTP, usually over the encrypted ports 993, 465 and 587 (or 143 with STARTTLS). POP3, Exchange Web Services and ActiveSync are not supported; Microsoft accounts run over IMAP as well. In networks that block the mail ports, no mail program can work. Details under Connection fails.
On top of that comes HTTPS (port 443) for the Microsoft sign-in, for updates, the license check and the integrations.
After a sync, much works offline too: reading, searching, sorting, writing (sending waits in the outbox). Only attachments that have never been opened need a connection.
Where the data lives
Section titled “Where the data lives”The data directory paths for all three systems are under Where the data lives.