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What to do if…
you get a warning that your email inbox is full and new messages are bouncing

Short answer

Stop the bounce now by freeing space in the account (including Trash/Deleted and Spam/Junk), then immediately test delivery from a different address and tell key contacts to resend anything important.

Do not do these things

  • Don’t click “upgrade/renew storage” links inside unexpected emails or pop-ups — treat them as potentially fake until you verify inside your account settings.
  • Don’t bulk-delete blindly (especially work, legal, finance, tenancy, medical, or immigration emails) if you might need them later.
  • Don’t assume missing emails will “arrive later” automatically — many senders will get a bounce and nothing is queued for you.
  • Don’t keep trying to “fix it” on multiple devices at once (it can create confusion about what you deleted and where).
  • Don’t change lots of security settings while panicking unless you have confirmed you’re signed into the real provider site/app.

What to do now

  1. Get a safe access point (one device, one browser/app).
    Use a device you trust, open your email provider’s official app or type the provider’s address yourself (not from an email link), and sign in.

  2. Confirm it’s truly a storage/quota problem (not a scam).
    Look for a storage meter/usage page in your account settings. If the warning only appears in a random email, treat it as suspicious until you see the same warning inside your account.

  3. Free space in the places that actually unblock delivery.
    Do these in order (because some systems don’t free space until you purge):

    • Empty Deleted Items/Trash.
    • Empty Junk/Spam.
    • Delete a small number of very large emails (often those with big attachments), then empty Deleted/Trash again.
    • If you use a provider where mail storage shares space with other services (common with major providers), remove large items there too so email can function again.

  4. Test whether email is flowing again (don’t guess).
    From a different email address (or ask a friend/colleague), send a short test message to your address.

    • If it bounces, keep freeing space and try again after a few minutes.
    • If it arrives, reply back from your main inbox to confirm sending also works.

  5. Capture what you might have missed.
    Make a short list of organisations/people likely to have emailed you in the last 24–72 hours (bank, payroll, school, delivery firm, healthcare, login codes). Contact them via a known channel and ask them to resend.

  6. If it’s a work or school account, use the correct route fast.
    If your email is managed by an employer/college:

    • Contact IT/helpdesk and say: “Mailbox quota reached; external senders are getting bounces.”
    • Ask whether there’s an archive mailbox, retention policy, or quota increase process you must follow before deleting.

  7. If anything looks like a scam warning, report it the UK way.
    If you received an email claiming your inbox is full and urging you to click a link or pay, forward it to report@phishing.gov.uk (the Suspicious Email Reporting Service), then delete it.
    If you can’t forward it from your email system, use the reporting route on GOV.UK for suspicious emails/websites.

What can wait

  • Organising folders/labels, unsubscribing from newsletters, or setting up long-term archiving rules.
  • Changing your email address everywhere (only do this if the problem keeps recurring).
  • Paying for more storage — only consider this once you’ve verified inside your account settings that you genuinely need it.

Important reassurance

This is common and fixable. The panic usually comes from “I might be missing something important” — once delivery is restored, you can calmly identify what bounced and ask for resends without trying to reconstruct everything right now.

Scope note

This is first-steps-only guidance to stop the bounce and stabilise access. If you’re on a managed work/school system, follow their IT process because deletion/retention rules may apply.

Important note

This guide is general information, not legal, security, or professional IT advice. If you suspect your account has been compromised (unexpected sign-ins, password reset emails you didn’t request, rules/forwards you didn’t set), prioritise account security and official support channels.

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