By Martin Dobson, AIERT Ltd
SaneBox and MailBroom get compared because they both promise a better inbox — but they solve different jobs. Confusing the two is the most common mistake in this comparison, so it's worth being direct about it upfront.
SaneBox is about prioritisation: managing the flow of email arriving today. MailBroom is about remediation: cleaning up storage and mail that already accumulated.If your problem is drowning in new email, that's a SaneBox problem. If your problem is an Exchange Online storage quota, a "mailbox full" ticket, or years of newsletters nobody unsubscribed from, that's a MailBroom problem.
SaneBox uses AI to filter and categorise incoming email — sorting lower-priority mail out of your main inbox (into folders like SaneLater), letting you block unwanted senders (BlackHole), snooze messages, and get daily digest summaries. It works with Gmail, Microsoft 365, Apple iCloud, Yahoo! Mail, Fastmail, and any IMAP, Exchange, or ActiveSync server — genuinely broad platform support.
What it doesn't do, as far as we found published, is bulk-delete accumulated mail or reduce mailbox storage usage. It reorganises where mail lives; it doesn't clear it out.
MailBroom for Business does the opposite job: Smart Sweep bulk-deletes or unsubscribes from newsletters and unused mail grouped by sender, Storage Cleanup frees space by age bracket or sender domain without breaking retention policy or legal hold, and Power Search finds and bulk-acts on specific mail across folders. None of that is about filtering what arrives today — it's about clearing what's already there, across an entire company's Microsoft 365 tenant if needed, including shared and delegated mailboxes.
| MailBroom for Business | SaneBox | |
|---|---|---|
| Core job | Bulk cleanup, storage remediation | Filtering, prioritisation |
| Reduces storage usage | Yes — deletion and unsubscribe | No — reorganises, doesn't delete |
| Platforms | Microsoft 365 / Exchange Online | Gmail, M365, iCloud, Yahoo, IMAP |
| Company-wide licensing | Per organisation, via SSO | Per individual account — ~$4.92/user/month per TheBusinessDive, no free plan |
| Team fit | Built for company-wide use | TheBusinessDive lists teams under "not ideal for" |
| Shared/delegated mailboxes | Explicitly supported | Not documented publicly |
Credit where it's due: SaneBox's own security documentation states that "most services authorise SaneBox without a password", specifically naming Google, Office365, Yahoo, and AOL — meaning for Microsoft 365 specifically, SaneBox uses OAuth, not a stored password. Where it does need direct credentials (iCloud, Fastmail, since those providers don't offer the same OAuth flow), it says those are encrypted with public-key cryptography and stored on servers unreachable from the public internet, with encryption keys in hardware security modules.
MailBroom's model is still slightly different in one respect: as a company-wide tool, it's built around one Microsoft SSO sign-in that an org admin controls and can revoke centrally for the whole domain, rather than each person authorising their own account individually. For M365 access specifically, though, this is one area where the two tools are reasonably comparable — the real differences are elsewhere (see the table below).
| Feature | MailBroom for Business | SaneBox |
|---|---|---|
| Bulk delete accumulated mail | ✓ | ✗ — reorganises, doesn't delete |
| Storage cleanup by age or domain | ✓ | ✗ |
| AI filtering/prioritisation of incoming mail | ✗ | ✓ |
| Shared/delegated mailbox support | ✓ | Not published |
| Company-wide SSO licensing | ✓ | ✗ — per-account plans |
| Works within retention policy / legal hold | ✓ | Not published |
| Non-Microsoft email providers | ✗ — via MailBroom for iOS instead | ✓ — Gmail, iCloud, Yahoo, IMAP |
| OAuth (no password) for M365 access | ✓ | ✓ — per SaneBox's own security docs |
"Not published" means we found no public documentation either way — not that the feature is absent.
Different kind of tool solving an adjacent problem. SaneBox is an AI-powered filtering and prioritisation layer — it sorts incoming email so the important stuff surfaces and the rest gets out of the way. MailBroom is a bulk cleanup and storage-remediation tool — it deletes, unsubscribes from, and frees space from mail that's already accumulated. One manages the flow of new mail; the other clears out the backlog.
Not as its core function. SaneBox reorganises where email lives within your inbox (moving lower-priority mail into folders like SaneLater) rather than deleting it or reducing what's stored. If the underlying problem is a mailbox approaching its Exchange Online storage quota, filtering alone doesn't fix that — the mail is still there, just relocated.
Yes — SaneBox states it works with Gmail, Microsoft 365, Apple iCloud, Yahoo! Mail, Fastmail, and any IMAP, Microsoft Exchange, or ActiveSync server. So it's a legitimate option for M365 users specifically looking for inbox prioritisation, just not for bulk storage cleanup or company-wide deployment.
That's a coherent combination, not a conflict — SaneBox manages what floods in day to day, while MailBroom periodically clears out what's built up (old newsletters, oversized attachments, years of accumulated storage) and handles company-wide concerns like shared mailboxes, leaver offboarding, and storage-quota tickets that a personal filtering tool isn't built to address.
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