Storage & Limits

This page covers how much you can store, how long things are kept, and how deletion works. For the protections applied to your mail — the Screener, Link Guard, tracking flags, and image blocking — see Privacy & Protections.

Storage and retention

What	Limit
Mailbox storage quota	5 GB per mailbox
Trash	Auto-empties after 30 days
Screened Out mail	Kept for 90 days, then removed
Attachments	25 MB total per message (details)

• Storage quota. Each mailbox holds up to 5 GB of mail and attachments — your personal mailbox and each company mailbox count separately. If you approach the limit, you'll see a warning in the app so you can free up space. Check your usage anytime in Settings → Storage (for the mailbox you're in). Files you share in Chat count against your company mailbox too.
• Trash. Messages you delete go to Trash and are removed automatically after 30 days. You can restore anything from Trash until then.
• Screened Out. Mail from senders you screen out is kept for 90 days in the silent Screened Out area, then cleaned up automatically. See The Screener.

Deleting mail for good

Trash gives you two ways to remove content immediately instead of waiting 30 days:

• "Delete forever" on a conversation in Trash permanently removes it.
• "Empty trash" permanently removes everything in Trash at once.

Both actions permanently delete the message content, including attachments — there is no undo. (Deleting mail on a connected phone is gentler: phone deletes land in your web Trash, so nothing is destroyed from your phone — see SingleSign Mail on Your Phone.)

Deleting your mailbox

If you delete your personal SingleSign Mail mailbox, all stored mail is permanently purged. This cannot be undone — there's no grace period for message content, so export anything you want to keep first. Deleting your mailbox does not delete your SingleSign account; you keep signing in as before.

A company mailbox belongs to the organization, so only its admins can delete it — for example after you leave. It's kept, locked, for 20 days first and can be restored in that window; after that its messages, files, and calendar are purged. Your personal mailbox is never touched by anything an organization does. See Company mailboxes.

Sending limits

Sending limits protect the deliverability of everyone's mail — the full details, including the separate limits for connected mail apps, are in Privacy & Protections.