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Delete Old Emails - Free Up Space

Deleting old emails in Gmail or Outlook can be tedious. Filters don't show cumulative storage impact. EmailSlim does.

Your email content stays private - we only analyze metadata

EmailSlim never deletes emails. All deletions happen in your inbox when you approve them.

EmailSlim dashboard showing active emails, attachments, quick declutter cards, and top domains and senders by storage.
Example EmailSlim dashboard. Data shown is sample only.

How to Delete Old Emails (Step-by-Step)

The manual method works but has a key limitation. Here's how it works — and the smarter alternative.

Open Gmail or Outlook

In Gmail, type older_than:1y in the search bar to find emails over a year old. For Outlook, use the filter menu to sort by date and select messages before a specific date.

Select all matching emails

In Gmail: click the checkbox at the top, then "Select all X conversations that match this search" to go beyond the first page. In Outlook: Ctrl+A selects visible messages in the folder.

Delete — they go to Trash first

Deleted emails move to Gmail Trash (recoverable for ~30 days) or Outlook Deleted Items. To reclaim storage immediately, empty the Trash / Deleted Items folder after deleting.

Repeat per sender or label

The manual method requires you to repeat this for each sender or label. There is no way to see which senders account for the most storage before you start deleting.

The problem with manual deletion

Gmail and Outlook filter by age, not size. An email from 6 months ago with a 25 MB attachment wastes far more space than 50 old newsletters combined. The manual method has no way to show which senders account for the most storage — so you end up deleting by guesswork.

Ranked by total sender storage

See which domains and senders use the most space. No guessing—delete the biggest first.

Top storage hogs
Sample inbox data (simulated, not live)
SenderEmailsStorage

newsletter@retailer.com

8,231 emails

2.4GB

deals@travelportal.com

3,104 emails

1.2GB

updates@saasapp.com

1,987 emails

740MB

EmailSlim ranks senders and domains by total storage used, so you can delete the biggest storage hogs first.

Manual search vs sender-based view

Manual search (inbox filters)

Search by date or sender one at a time. No view of total storage per sender — you guess which senders to clean.

Hard to see cumulative impact: thousands of small emails from one sender can add up to gigabytes.

EmailSlim sender-based view

See which senders use the most storage, ranked by total size. Delete old emails by sender — not by guesswork.

One view shows cumulative impact so you reclaim space where it matters.

Why Delete Old Emails with EmailSlim?

Delete old emails automatically
Identify emails older than your specified date
Bulk delete thousands of old emails safely
Free up storage space from old messages
One-click delete for old promotional emails
Privacy-first: never reads your email content