Outlook Not Receiving Emails? Try These 9 Fixes in Order

Start with webmail, not a reinstall. If a fresh message reaches your mailbox in a browser but not the Outlook app, check the app’s view, sync, and sign-in. If it is missing from webmail too, check where the account puts incoming mail and whether the provider received it.

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Oliver Jackson

Head of Customer Happiness

Michael Bodekaer
Reviewer

Co-founder and CEO

Jose Lopez
Tester

Head of Growth Engineering

Authored By Oliver Jackson Head of Customer Happiness

Oliver is Mailbird's Head of Customer Happiness, bringing more than a decade of experience in email. His background in email marketing, where his strategic and creative approach to campaigns drove growth and engagement for businesses across diverse industries, shapes how he helps people get more out of their inbox. Oliver is known for his insightful webinars and guest posts, where he shares his expert knowledge.

Reviewed By Michael Bodekaer Co-founder and CEO

Michael Bodekaer is a recognized authority in email management and productivity solutions, with over a decade of experience in simplifying communication workflows for individuals and businesses. As the co-founder of Mailbird and a TED speaker, Michael has been at the forefront of developing tools that revolutionize how users manage multiple email accounts. His insights have been featured in leading publications like TechRadar, and he is passionate about helping professionals adopt innovative solutions like unified inboxes, app integrations, and productivity-enhancing features to optimize their daily routines.

Tested By Jose Lopez Head of Growth Engineering

José López is a Web Consultant & Developer with over 25 years of experience in the field. He is a full-stack developer who specializes in leading teams, managing operations, and developing complex cloud architectures. With expertise in areas such as Project Management, HTML, CSS, JS, PHP, and SQL, José enjoys mentoring fellow engineers and teaching them how to build and scale web applications.

Outlook Not Receiving Emails? Try These 9 Fixes in Order
Outlook Not Receiving Emails? Try These 9 Fixes in Order

Start with webmail, not a reinstall. If a fresh message reaches your mailbox in a browser but not the Outlook app, check the app’s view, sync, and sign-in. If it is missing from webmail too, check where the account puts incoming mail and whether the provider received it.

Quick checklist

  • □ Check the same account in webmail; request a fresh test.
  • □ Search Junk, Other, Archive, Deleted Items, and all folders.
  • □ Clear Inbox filters; pause rules that move or delete mail.
  • □ Check storage and empty Deleted Items if needed.
  • □ Sync the app; turn off classic Outlook’s Work Offline mode.
  • □ Check blocked senders and forwarding.
  • □ Resolve sign-in errors; check provider status or ask IT to trace delivery.
  • □ If sending is the problem, inspect the oldest email in Outbox.

Before you start

  • Have ready: Your email address, browser sign-in, and any sign-in code you normally use. If possible, ask someone with a different email address to send a fresh test message.
  • Tools: A browser and your Outlook app. No special software is needed.
  • Time and cost: Checking settings costs nothing. An outage or account-support request can take longer to resolve.
  • Safety: Confirm you are checking the right account before deleting mail or changing rules. Ask IT before changing settings on a work mailbox. Do not remove a classic Outlook account or delete local mail files just to test syncing.

Find the missing mail: step by step

Find the missing mail: step by step

  1. Check the mailbox in a browser first.

    For an Outlook.com, Hotmail, or Live address, sign in to Outlook.com . For a Microsoft 365 work or school address, use Outlook on the web . If Outlook displays a Gmail, Yahoo, or other provider’s account, open that provider’s webmail instead. Confirm the address shown in the browser matches the account missing mail, then request a fresh test message.

    Check: If the test appears in webmail but not the app, check the app’s folders and filters in step 2, then go to steps 5 and 8. If it is missing from webmail, continue with the account checks.

  2. Look beyond the main Inbox.

    Search for the sender or subject across all folders. Check Junk Email , Deleted Items , Archive , and both Focused and Other if those tabs appear. Clear any active message-list filter and sort by date. If you find the email in Junk, mark it as not junk. An email in Other has not necessarily failed to arrive: Focused Inbox separates messages into two tabs. [1]

    Check: Can you find the test message in any folder or tab?

  3. Pause rules that move or delete incoming mail.

    For a Microsoft mailbox in new Outlook, Outlook on the web, or Outlook.com, open Settings → Mail → Rules . Look for rules that move, delete, redirect, or forward the sender’s mail. Turn off a suspect rule, then request another test. In classic Outlook, use File → Manage Rules & Alerts and clear the rule’s checkbox. Check whether an Outlook.com Sweep setting is clearing that sender’s messages, too. Some classic Outlook rules run only while the classic app is open, so inspect them even if the web mailbox looks normal. [2]

    Check: Does a new test arrive after the suspect rule is paused?

  4. Check whether storage is full.

    For Outlook.com, open Settings → Account → Storage and check both mailbox and Microsoft cloud storage. If either is full, remove mail you no longer need and empty Deleted Items ; moving messages there alone does not free mailbox space. For a work account, ask IT to check its quota if you cannot see it. Outlook.com messages sent while storage is full can be returned to the sender rather than delivered later, so ask for a resend after space is available. [3]

    Check: Does storage show available space, and does a newly sent test arrive?

  5. Refresh the app and check offline mode.

    If mail appears on the web but not on your computer, confirm the computer is online. In new Outlook , open View → Sync . In classic Outlook , check the status bar. If it says Working Offline , open Send/Receive → Work Offline to return online, then choose Send/Receive All Folders . Close and reopen the app if the Inbox still does not refresh (see fix Outlook sync conflicts ). The new Outlook Sync button does not offer the same manual-sync behavior for every third-party account; use that provider’s webmail to confirm delivery. [4]

    Check: Does the message already visible on the web now appear in the app?

  6. Remove an accidental sender block.

    For a Microsoft mailbox in new Outlook or on the web, open Settings → Mail → Junk email and inspect blocked addresses and domains. In classic Outlook, open Home → Block → Junk E-mail Options → Blocked Senders . Remove the sender or domain if it should not be blocked, and check Junk for earlier messages. For a Gmail, Yahoo, or other third-party mailbox in new Outlook, check the block list at the email provider instead. [5]

    Check: Is the sender unblocked, and does a fresh message reach the expected folder?

  7. Check automatic forwarding.

    In new Outlook or Outlook on the web, open Settings → Mail → Forwarding . In Outlook.com, look under Settings → Mail → Forwarding and IMAP . Turn off forwarding you do not want, or check whether Keep a copy of forwarded messages is enabled where offered. In classic Outlook, recheck rules for a forward or redirect action. If you did not set up the forwarding address, treat it as a possible account-security problem and follow your provider’s account-recovery guidance. [6]

    Check: Is mail going only where you intend, and does a fresh test stay in your mailbox?

  8. Resolve a sign-in prompt or connection error.

    If webmail works but Outlook asks you to sign in, finish the sign-in prompt for the affected account. If you recently changed its password, sign in to the app again with the updated credentials. For a work account, contact IT if an organization setting blocks sign-in. Do not repeatedly remove and re-add an account that may contain local-only mail. [7]

    Check: Has the error cleared, and does the web-visible test message appear in Outlook?

  9. Check for an outage—or ask where delivery stopped.

    If a fresh test is absent from webmail and the earlier checks found nothing, check the Microsoft service-health page or your email provider’s status page. For a work mailbox, ask IT to check Microsoft 365 admin center → Health → Service health and trace the missing message. Give them the sender, recipient, subject, and approximate send time. If only one sender is affected, ask that person to check for a delivery-failure notice. Reinstalling a desktop app cannot restore a message that never reached your mailbox. [8]

    Check: Do you have a confirmed incident, a delivery result, or a sender error to act on?

Why this order works

The browser test separates a mailbox or provider problem from a desktop-app problem. Mail found in another folder points to a view, rule, or junk setting. Mail found only on the web points toward the app’s sync or sign-in. If a fresh test never reaches webmail, focus on account settings, the sender’s delivery error, or the provider.

Troubleshooting other symptoms

Emails stuck in the Outbox or not sending?

That is the reverse problem. Check whether Outlook is offline, then open Outbox and inspect the oldest stuck message. If it has a large attachment, remove the attachment and send a file link instead. Check storage and any sign-in prompt before trying again. If you receive a delivery-failure notice, read its stated reason before changing settings. [7]

Match the symptom to the next fix

Symptom Possible cause Next step
Mail appears on the web, not in Outlook. App view, sync, offline mode, or sign-in. Check steps 2, 5, and 8.
Mail from one person is in Junk. Junk filtering or a blocked sender. Mark it as not junk and check step 6.
Mail seems to disappear after Outlook opens. A rule or another mail app is moving it. Search all folders and pause suspect rules in step 3.
The Inbox looks empty, but search finds messages. A filter, sort order, or Focused/Other view. Clear the filter and check both tabs in step 2.
No new mail arrives, and storage shows full. Mailbox or cloud storage limit. Free space, empty Deleted Items, and request a resend.
A copy goes to an unfamiliar address. Forwarding or a redirect rule. Check steps 3 and 7; secure the account if you did not make the change.
Several coworkers cannot receive mail. A shared service or organization issue. Ask IT to check service health and message traces.
Only one sender’s test never reaches webmail. Delivery rejected or delayed before it reaches the Inbox. Ask for the sender’s delivery-failure notice and contact the provider or IT.
Symptom
Mail appears on the web, not in Outlook.
Possible cause
App view, sync, offline mode, or sign-in.
Next step
Check steps 2, 5, and 8.
Symptom
Mail from one person is in Junk.
Possible cause
Junk filtering or a blocked sender.
Next step
Mark it as not junk and check step 6.
Symptom
Mail seems to disappear after Outlook opens.
Possible cause
A rule or another mail app is moving it.
Next step
Search all folders and pause suspect rules in step 3.
Symptom
The Inbox looks empty, but search finds messages.
Possible cause
A filter, sort order, or Focused/Other view.
Next step
Clear the filter and check both tabs in step 2.
Symptom
No new mail arrives, and storage shows full.
Possible cause
Mailbox or cloud storage limit.
Next step
Free space, empty Deleted Items, and request a resend.
Symptom
A copy goes to an unfamiliar address.
Possible cause
Forwarding or a redirect rule.
Next step
Check steps 3 and 7; secure the account if you did not make the change.
Symptom
Several coworkers cannot receive mail.
Possible cause
A shared service or organization issue.
Next step
Ask IT to check service health and message traces.
Symptom
Only one sender’s test never reaches webmail.
Possible cause
Delivery rejected or delayed before it reaches the Inbox.
Next step
Ask for the sender’s delivery-failure notice and contact the provider or IT.

What changes by Outlook version?

  • New Outlook for Windows : Use View → Sync and Settings → Mail for supported Microsoft mailbox settings. For a third-party account, manage rules or blocked senders that are not available in Outlook at that provider’s website. [2]
  • Classic Outlook for Windows: Check the status bar and Send/Receive tab. Review Manage Rules & Alerts in the app as well as rules visible on the web; classic Outlook can run rules that the web version does not. [2]
  • Outlook.com: The website is your account-level check. Pay particular attention to Settings → Account → Storage , Junk, rules, and forwarding. If the website cannot receive a fresh test after those checks, changing desktop clients will not solve delivery to the account. [9]

If messages arrive normally but Outlook freezes or takes a long time to open them, use the separate slow-Outlook guide. For more about how the desktop and web experiences differ, see our Outlook desktop–web transition guide .

Frequently asked questions

Why can I send emails but not receive them in Outlook?

Sending and receiving can fail for different reasons. Check for a new message in webmail first, then look in Junk and Other, inspect rules, and check storage.

Why does Outlook receive mail on my phone but not my computer?

Open the same account in a browser. If the message is there, check the computer app’s folders, filters, connection, offline mode, sync, and sign-in.

Where did an email go if it is not in my Inbox?

Search all folders, including Junk, Archive, and Deleted Items. If your Inbox has Focused and Other tabs, check both and clear any active filter.

Will freeing storage bring back emails sent while my mailbox was full?

Not necessarily. Once you have available space, ask the sender to send the missing message again.

Why am I missing emails from just one sender?

Check Junk, blocked senders, and rules for that address or domain. If a fresh test never appears in webmail, ask the sender for any delivery-failure notice.

Should I reinstall Outlook if no emails are coming in?

Not first. Check webmail: if mail is missing there too, reinstalling the desktop app will not fix delivery to the mailbox.

Want a different desktop inbox?

If your account receives mail on the web but you would rather use another email app, download Mailbird for Windows or Mac at Mailbird download page and connect your account. Mailbird is an email client, not an email provider: it will not fix a full mailbox or a provider outage.

Sources

  1. Microsoft Support: Focused Inbox for Outlook
  2. Microsoft Support: Manage email messages by using rules in Outlook
  3. Microsoft Support: Storage limits in Outlook.com
  4. Microsoft Support: Sync to manually check for new mail
  5. Microsoft Support: Block or unblock senders in Outlook
  6. Microsoft Support: Turn automatic forwarding on or off in Outlook
  7. Microsoft Support: I can't send or receive messages in Outlook
  8. Microsoft Learn: Trace an email message in Exchange Online
  9. Microsoft Support: Can't send or receive email in Outlook.com