Mailstrom
Bundle and bulk-manage email by sender, subject, or time
About Mailstrom
Mailstrom is a web-based inbox cleaner that connects to Gmail, Outlook, Yahoo, iCloud, and IMAP accounts and groups your email into bundles you can act on as a single block. Instead of triaging messages one-by-one, you delete, archive, or auto-clean thousands at once.
Pros & Cons
Pros
- Bundling is unmatched for power users — the most flexible grouping logic in the category
- Sub-second action on bundles even with 100k+ messages
- Block + Expiration combo is a 'set and forget' inbox slimmer that rivals SaneBox's auto-trash
- Read-only architecture: never stores message bodies
- Long-running, stable product (since 2011) with consistent uptime
Cons
- Interface looks dated next to newer competitors
- No native mobile app — web-only
- No AI/importance ranking; everything is manual rules
Key Features
Bundle View
Groups email by sender, subject, list, time, size and more for batch actions.
Block Sender
One-click block to send all future mail from a sender straight to trash.
Expiration Dating
Set rules to auto-delete messages from a sender after X days.
Unsubscribe Helper
Detects mailing lists and surfaces working unsubscribe links in one place.
Mapped Searches
Saved smart searches that turn complex queries into one-click bundles.
Multi-Provider
Works with Gmail, Google Workspace, Outlook/Microsoft 365, Yahoo, iCloud, AOL, IMAP.
Pricing
- 1 email account
- All bundling features
- Unsubscribe + block
- Expiration rules
- Up to 3 accounts
- All Basic features
- Priority processing
- 1 account
- All features
- Best value
Best For
Heavy Newsletter Subscribers
Bundle every newsletter sender, then mass-unsubscribe and auto-delete archives in one pass.
Storage-Quota Recovery
Bundle by 'largest attachments' to free Gmail storage without losing important threads.
Long-Term Inbox Hygiene
Set expiration rules so promotional senders self-clean every 30 days going forward.
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