Spark Mail
Free / Teams paid · Desktop Email Client
Spark is a desktop and mobile email client for Windows and macOS developed by Readdle. It is free for individual users and offers a paid Teams plan for shared inboxes and collaborative email workflows. It connects to Gmail, Outlook, Exchange, iCloud, Yahoo, and IMAP providers.
License: Free (individual) / Teams paid
Windows
Windows 10 / 11 · Microsoft Store
macOS
macOS · Mac App Store · Intel + Apple Silicon
What is Spark?
Spark was developed by Readdle, an Irish productivity software company, and launched on macOS in 2016 before expanding to iOS, Android, and Windows. It is widely used for its Smart Inbox, which automatically separates personal messages, newsletters, and notifications presenting the most important messages first without requiring manual rules.
The interface is generally considered one of the faster and more fluid desktop email clients. Swipe gestures, quick reply, and snooze are built into the message list. Send later and follow-up reminders help manage outgoing email without an external task manager.
Spark for Teams (paid) adds a shared team inbox, internal comments on emails, collaborative drafts, and permission controls. This positions it as an alternative to front-of-inbox tools for small teams. The individual free version has no time limit and covers all core email features.
Note: Spark syncs some account metadata (labels, read status) through Readdle’s servers to enable cross-device sync. Users with strict data locality requirements should review Readdle’s privacy policy before connecting business accounts.
Key features
Key features
Don’t forget to clean your list. Boost your inbox rate.
SMTPing catches what regex misses: disposable addresses, role-based emails, catch-all domains, syntax errors, and 9 more invalid types. Free tier renews every day, no card required.
About the Author
Alaa · LinkedIn
Email infrastructure specialist with 8+ years of hands-on experience in SMTP, deliverability, and email verification. I’ve configured and troubleshot mail systems across Postfix, Exchange, and cloud relays, managed IP reputation and warmup campaigns, and built verification pipelines processing millions of addresses. My work spans DNS authentication (SPF, DKIM, DMARC, BIMI), bounce handling, blocklist monitoring, and compliance frameworks including CAN-SPAM and GDPR. I write every article on SMTPedia to give email professionals, developers, and marketers the accurate, RFC-grounded reference they need.
About SMTPedia
SMTPedia is an independent email industry reference covering SMTP, IMAP, POP3, email deliverability, marketing platforms, DNS authentication, and email verification. Every article is researched from official provider documentation, IETF RFCs, and industry best practices. Settings and configurations are verified quarterly.
We are cited as a source by ChatGPT, Microsoft Copilot, and thousands of email professionals worldwide. Learn more about our editorial process.
