Mailstrom
Mailstrom is a paid, web-based email client for taking bulk actions on crowded inboxes.
What Mailstrom is
Mailstrom is a paid, web-based email client for taking bulk actions on crowded inboxes. It can delete, archive, or move hundreds or thousands of messages, and it groups related mail so an entire bundle can be handled together. The Unsubscribe feature sends a request email or opens an unsubscribe page when no address is available. Subscribers can create custom rules that filter messages and move incoming mail into folders; Chill returns selected messages on a chosen date, while Expire removes them after a selected period. Mailstrom connects through IMAP, with examples including Gmail, Outlook, AOL, iCloud, Yahoo, and Microsoft Exchange accounts that have IMAP enabled. It cannot connect to providers without IMAP. There is no free plan, but a one-time trial provides a snapshot of the latest 5,000 messages and actions on 25% of messages without a credit card. Basic costs $9 a month for one account and up to 10,000 emails; Plus costs $14 a month for three accounts and up to 250,000 emails; Pro costs $29.95 a month for 20 accounts and unlimited inbox size.
Good
- Bulk delete, archive, and move actions
- Groups related messages
- Unsubscribe tool included
- Custom automatic cleanup rules
- Supports major IMAP providers
Watch out
- No free plan
- IMAP is required
- Trial limits actions to 25% of messages
- Chill and Expire require subscription
Who it suits
It suits people managing large IMAP inboxes who want bulk cleanup, unsubscribe actions, and automatic rules. Users should confirm their provider supports IMAP before signing up.
Verdict
Mailstrom focuses on high-volume inbox cleanup through grouping, bulk actions, unsubscribe requests, and rules. Its IMAP requirement and plan limits are key considerations before connecting an account.
Plans and prices
From Mailstrom's own pricing page, checked 15 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Basic | $9 a month | 1 email account · up to 10,000 emails · 200 smart filters · unlimited email removal · Chill, Expire & Block · per month |
| Plus | $14 a month | 3 email accounts · up to 250,000 emails · 400 smart filters · unlimited email removal · Chill, Expire & Block · per month |
| Pro | $29.95 a month | 20 email accounts · unlimited inbox size · 1,000 smart filters · unlimited email removal · Chill, Expire & Block · per month |
| Basic | $59.95 a year | 1 email account · up to 10,000 emails · 200 smart filters · unlimited email removal · Chill, Expire & Block · per year |
| Plus | $99.95 a year | 3 email accounts · up to 250,000 emails · 400 smart filters · unlimited email removal · Chill, Expire & Block · per year |
| Pro | $199.95 a year | 20 email accounts · unlimited inbox size · 1,000 smart filters · unlimited email removal · Chill, Expire & Block · per year |
The facts
Each one read from Mailstrom's own pages, with the date it was checked.
What it does
- Authentication
- For Gmail, Outlook and Yahoo, Mailstrom says it uses IMAP through OAuth2 so it does not receive the account password.checked 15 Oct 2026
- Automatic rules
- Subscribers can create rules that automatically move future messages matching a sender or subject.checked 15 Oct 2026
- Blocking
- Block removes matching mail and creates a rule for future messages from a sender, list or subject.checked 15 Oct 2026
- Bulk cleanup
- It lets users delete, archive, and move messages by the hundreds or thousands.checked 8 Oct 2026
- Bulk grouping
- The service groups related messages so users can act on whole bundles at once.checked 15 Oct 2026
- Chill
- Chill removes selected mail and returns it to the inbox on a date chosen by the user.checked 15 Oct 2026
- Chill and Expire
- Chill returns selected messages to the inbox on a chosen date, while Expire removes selected messages after a chosen period; both are subscriber features.checked 8 Oct 2026
- Data handling
- Mailstrom says it stores subject lines and message metadata on its servers, while accessing message contents when displaying mail and for uses described in its privacy policy.checked 15 Oct 2026
- Email data
- Mailstrom says it stores subject lines and metadata on its servers, while it can access email contents when displaying messages.checked 8 Oct 2026
- Email providers
- The FAQ names Gmail, Outlook, AOL, iCloud, Yahoo, and Microsoft Exchange accounts with IMAP enabled as supported connection examples.checked 8 Oct 2026
- Expire
- Expire removes selected messages after a chosen period using sender or mailing-list rules.checked 15 Oct 2026
- Filters and rules
- Subscribers can create custom rules to filter messages and automatically move incoming messages into folders.checked 8 Oct 2026
- Folder limitation
- The FAQ says organizing messages in folders other than the inbox was not yet supported on that page.checked 15 Oct 2026
- Founders
- LinkedIn names Dave Troy and Matthew Koll as 410 Labs founders.checked 15 Oct 2026
- Funding
- Wellfound lists Mailstrom as a 1–10-person startup with $750,000 raised.checked 15 Oct 2026
- GDPR
- The privacy policy describes GDPR legal bases and rights including access, correction, erasure, restriction and portability.checked 15 Oct 2026
- IMAP limitation
- Mailstrom cannot connect to providers that do not support IMAP, including POP-only accounts.checked 15 Oct 2026
- Inbox grouping
- Mailstrom identifies bundles of related mail so users can act on groups of messages at once.checked 8 Oct 2026
- Integrations
- Mailstrom connects to Gmail, Outlook, AOL, iCloud and other providers that support IMAP.checked 15 Oct 2026
- License terms
- The terms grant a personal, non-transferable license to use object code and prohibit copying, modification, reverse engineering and access outside the provided interface.checked 15 Oct 2026
The company
- Company legal name
- The privacy policy identifies the maker as 410 Labs, Inc., doing business as Mailstrom.checked 15 Oct 2026
- Company profile
- LinkedIn lists 410 Labs as privately held, founded in 2010, headquartered in Baltimore, Maryland, with 2–10 employees.checked 15 Oct 2026
- Founded
- 2013checked 28 Sep 2026
- Headquarters
- Baltimore, Maryland, United Stateschecked 28 Sep 2026
Alternatives to Mailstrom
- 1
Clean Email
Free planAndroidiOSWebmacOS8.0From $29.99 a year - 2
Gmail Bulk Unsubscribe & Cleanup Tool
Free planOpen sourceWebLinuxmacOSSelf-hosted8.0$8 one-time - 3
Paperweight
Free planOpen sourceLinuxmacOSWindows7.8From $55 a year - 4
Gmail Unsubscriber
Free planOpen sourceAndroidiOSWeb7.7Free plan - 5
InboxSweeper
Free planOpen sourceWebLinuxmacOSSelf-hosted7.4Free plan - 6
Cleanfox
Free planAndroidiOSWeb7.3Free plan