If Outlook has stopped receiving new emails, the cause is usually one of a handful of things: a sync problem, a full mailbox, messages landing in Junk, an inbox rule quietly moving mail, a sign-in issue, a connectivity hiccup, or — for work and school accounts — a Microsoft 365 mail-flow or quarantine setting blocking messages before they ever reach you.
The fastest way to fix it is to figure out which category you’re dealing with, then work through the checks below. This guide covers Outlook.com, the Outlook desktop app (classic and new), Outlook on the web, Outlook mobile, and Microsoft 365 business accounts, since the causes — and who can fix them — aren’t always the same.
Table of Contents
Why Is Outlook Not Receiving Emails?
Before troubleshooting, it helps to know what’s actually possible. Outlook can fail to show new mail for reasons that live on your device, in your account settings, or on Microsoft’s servers:
- Outlook is offline or stuck mid-sync — the app isn’t actively checking for new mail
- A weak or dropped internet connection — Outlook can’t reach the mail server at all
- The mailbox is at or near its storage limit — new messages can be affected once a mailbox is full
- Messages are landing in Junk Email or another folder instead of the inbox
- A sender has been blocked, intentionally or by mistake
- An inbox rule is moving, forwarding, or deleting incoming messages automatically
- Sign-in or authentication problems — an expired password or interrupted authentication can quietly stop the app from syncing
- The Outlook app itself needs an update or repair
- A Microsoft 365 service issue affecting mail delivery for your organization
- Anti-spam or quarantine policies holding messages from external senders (business accounts only)
- Security or attachment filtering blocking specific message types
Outlook.com and personal Microsoft accounts are affected by a smaller set of these causes. Microsoft 365 business, school, and organizational accounts add server-side variables — like mail-flow rules and quarantine — that an individual user often can’t see or change without an administrator.
If you’re connecting a third-party account like AOL Mail through Outlook, the cause can sometimes be specific to that provider rather than Outlook itself. See our guide on AOL Mail not working with Outlook if that applies to you.
First, Find Out Where the Problem Is
Before working through individual fixes, run this quick check — it tells you whether you’re dealing with a delivery problem (mail never reached your mailbox) or a sync problem (mail is there, but your app isn’t showing it). Knowing which one you have saves time, since the fixes are different.
Quick test: Does the missing email appear in Outlook on the web?
- Yes, it’s there: Your mailbox received the message. The problem is local — your desktop app, mobile app, or device isn’t syncing it. Focus on the app-specific fixes below (steps 6, 9, and 10, or the mobile section).
- No, it’s not there either: The message never fully reached your mailbox. Focus on storage, Junk Email, blocked senders, rules, and — for business accounts — quarantine and mail-flow settings.
Here’s the full workflow if you want to be thorough:
- Send a test email from a different account you control
- Check Junk Email and the Other/Focused tab for the test message
- Open Outlook on the web in a browser and check whether the test message arrived there
- If it’s in Outlook on the web: the problem is local syncing in your desktop or mobile app
- If it’s not in Outlook on the web either: the message never fully reached your mailbox
- If the sender reports a bounce: the problem is on the delivery side entirely, before it ever reached Microsoft’s servers
With that narrowed down, move on to the specific fix below.
How to Fix Outlook Email Not Receiving Emails
Work through these in order, starting with the simplest and most common causes.
1. Check Your Internet Connection and Refresh Outlook
If your device has no connection, or a weak one, Outlook can’t check for new mail even though everything looks normal on screen. Confirm you can load a website or another app that needs the internet. Then manually refresh: in classic Outlook for Windows, use Send/Receive; in Outlook on the web, refresh the browser page; in Outlook mobile, pull down on the message list to refresh. If mail starts coming in right after a manual refresh, connectivity was the issue.
2. Make Sure Outlook Is Not Offline
Desktop Outlook has a Work Offline mode that stops it from syncing with the server. It’s easy to toggle by accident. Check the Send/Receive tab for a “Work Offline” option that may be highlighted or selected, and turn it off if so. Also check your account’s connection status in the bottom status bar of the Outlook window — it should say “Connected,” not “Disconnected” or “Trying to connect.”
3. Check Your Outlook Mailbox Storage
When a mailbox reaches its storage limit, incoming messages may be rejected, delayed, or otherwise affected depending on the account type and service configuration. This is one of the most common — and most overlooked — causes of “missing” email.
Storage limits vary by account type, so don’t assume a single number applies to you:
- Free Outlook.com accounts have a smaller default mailbox allowance
- Microsoft 365 personal and family subscriptions raise that ceiling significantly
- Microsoft 365 business (Exchange Online) mailboxes have their own limits that depend on the specific plan, and an administrator can adjust them
Check the storage details for your specific Outlook or Microsoft 365 account to see your actual quota and which folders and data are contributing to it. If you’re close to the limit, archive or delete old messages — especially large attachments — and clear out Deleted Items and Junk Email, since these commonly count toward mailbox storage as well.
4. Check the Junk Email Folder and Blocked Senders
Legitimate emails sometimes get filtered as spam, especially from new senders or domains with imperfect email authentication. Open the Junk Email folder and look for anything that shouldn’t be there. If you find a wrongly filtered message, mark it as Not Junk so future mail from that sender lands in the inbox.
Also check your blocked senders list. It’s easy to block someone by accident, or a sender’s email address may have changed without you noticing (for example, after they switched providers or moved to a new domain).
5. Check Outlook Rules and Filters
Inbox rules can automatically move, forward, categorize, or even delete incoming messages based on sender, subject, or keywords — often without any visible sign that it happened. Review your rules list (found under Outlook’s Mail settings, sometimes labeled “Rules” or “Rules and Alerts” depending on your version) and look for anything that redirects or deletes messages from the sender or domain you’re missing. Disable or edit any rule that looks suspicious, then test again.
6. Check Whether Outlook Is Syncing New Messages
There’s a difference between a message being delivered to your mailbox and Outlook displaying it. Delivery happens on Microsoft’s servers; syncing is your app or browser pulling that mail down to show you. If you already ran the webmail test above and confirmed the message is on the server but missing from your app, this is your issue. Try closing and reopening the app, or removing and re-adding the account (step 10) if syncing stays broken after a restart.
7. Check Your Outlook Account and Sign-In Status
An expired password, interrupted authentication, or an account sign-in problem can prevent Outlook from syncing new messages even though the mailbox itself may still be receiving mail. Sign out and back in, or check your account status directly in Outlook’s account settings for any sign-in error or “action needed” prompt. For Microsoft 365 work or school accounts, a password reset by IT or an expired app password can have the same effect.
8. Check Microsoft 365 or Outlook Service Status
Occasionally, the interruption isn’t on your end at all. Microsoft publishes service health information for Microsoft 365 services, including Exchange Online and Outlook, which administrators can check from the Microsoft 365 admin center. Individual users can also check Microsoft’s public service status pages. Don’t assume there’s an outage — verify it before ruling out the other, more common causes above.
9. Update or Repair the Outlook App
An outdated or corrupted Outlook installation can cause sync failures that look like a “not receiving emails” problem. Check for and install any available app updates. On Windows, Microsoft 365 or Office installations may also provide repair options through Windows settings — the exact options depend on your specific Office installation and Outlook version.
10. Remove and Re-add Your Outlook Account
If the problem appears to be limited to Outlook’s local app or profile rather than server-side delivery, removing and re-adding the account can sometimes resolve persistent synchronization problems that a restart didn’t fix. Before doing this:
- Confirm you know your current password and can complete any required two-factor sign-in
- Understand that this re-downloads your mail and may temporarily hide messages while syncing rebuilds
- Back up anything stored only locally, since removing an account can affect offline data depending on your setup
For Microsoft 365 and Exchange accounts specifically, this isn’t usually a first-line fix — check sync status, sign-in status, and app updates first.
New Outlook Not Receiving Emails
If you’re using the new Outlook app for Windows, start with the same webmail test described above. Check whether the account shows as connected and syncing normally in the app’s account settings, then open Outlook on the web with the same account. If new messages appear there but not in the new Outlook app, the issue is most likely app or account synchronization rather than email delivery — try steps 6, 9, or 10.
Outlook Not Receiving Emails but Can Send
This is one of the more confusing versions of the problem. Sending and receiving are separate parts of email delivery, so one can work while the other fails. For example, Outlook may successfully send messages while incoming mail is being filtered, held, delayed, or not syncing to the app.
If you can send but not receive, check in this order:
- Mailbox storage — a full or near-full mailbox can affect incoming mail while outgoing mail keeps working
- Junk Email and blocked senders — the messages may be arriving, just not where you’re looking
- Rules — an active rule could be redirecting or deleting new mail before you see it
- Sync status — confirm Outlook is actually checking for new mail and not stuck offline
- Server-side delivery — for Microsoft 365 accounts, ask your admin to check mail flow and quarantine, since messages can be held before they ever reach your mailbox
Outlook Not Receiving Emails From One Person
When only one sender’s messages are missing, the cause is usually specific to that sender rather than your whole account:
- Check whether that sender’s address is on your blocked senders list
- Search your Junk Email folder for their name or domain
- Check inbox rules for anything targeting their address or domain
- If you use Focused Inbox, check the Other tab — messages there are technically delivered, just sorted differently
- Ask the sender to confirm the exact email address they’re using; a typo or an old address on their end will look identical to a delivery failure on yours
- Ask them whether their email bounced or returned an error — that points to a sender-side or domain-level issue, not something wrong with your Outlook
If everything on your side looks clean and the sender confirms no bounce, the issue is more likely happening between the sender’s provider and yours — which points toward a server-side or domain reputation issue rather than an Outlook setting.
Outlook Not Receiving Emails From Gmail
Gmail and Outlook are fully interoperable — there’s no inherent incompatibility between the two — so a pattern of missing Gmail messages often points to filtering, sender-side delivery problems, or, for business accounts, Microsoft 365 mail-flow and security policies. To troubleshoot:
- Check Junk Email and blocked senders for the Gmail address
- Ask the Gmail sender to check whether their message bounced back with an error
- Have them send a test message and check if it arrives within a few minutes
- For Microsoft 365 business accounts, ask your administrator to check quarantine and mail-flow logs for the sender’s address or domain — anti-spam policies sometimes flag Gmail messages more aggressively depending on your organization’s settings
Outlook Not Receiving Emails From Outside the Organization
This one is specific to Microsoft 365, work, and school accounts. Business mailboxes have security layers that personal Outlook.com accounts don’t, and any of these can prevent external mail from reaching an inbox:
- Anti-spam and anti-phishing policies that quarantine messages from unfamiliar external senders
- Mail-flow (transport) rules configured to hold, redirect, or block mail based on sender domain
- Blocked domains or senders added at the organization level, not just individually
- External mail restrictions some organizations apply by policy, sometimes limiting who outside the company can email specific users or groups
For example, if messages from coworkers arrive normally but messages from Gmail, Yahoo, or other external domains don’t, the problem likely sits in external mail filtering or an organization-level mail-flow policy rather than anything in your personal Outlook settings.
These settings live in the Microsoft 365 admin tools, not in a regular user’s Outlook app, so an individual employee usually can’t view or fix them directly. If external senders report their emails aren’t reaching you, this is a case where your IT administrator needs to check the organization’s mail-flow rules and quarantine, not something to troubleshoot from your own inbox alone.
Outlook Not Receiving Emails on iPhone or Phone
A message can be successfully delivered to your mailbox and still fail to show up promptly in the mobile app. That’s a device- or app-level sync issue, separate from delivery — the same webmail test above applies here too.
Outlook Not Receiving Emails on iPhone
Work through these:
- Confirm the account is still signed in and shows no error in the Outlook app’s account settings
- Check that Background App Refresh is enabled for Outlook in iPhone Settings, so the app can check mail when it’s not open
- Confirm notifications are turned on for Outlook, both in the app and in iOS notification settings
- Update the Outlook app if an update is available
- If sync still fails, remove and re-add the account in the app
Outlook Not Receiving Emails on iPad
The same checks apply on iPad: confirm sign-in status, Background App Refresh, notification permissions, and that you’re on the latest app version. iPadOS and iOS share most of these settings, so there’s no separate iPad-specific fix beyond what’s listed above.
Outlook Work or Business Email Not Receiving Emails
Microsoft 365 business accounts can fail for reasons a personal account never encounters, because delivery passes through your organization’s security and mail-flow configuration before it ever reaches your inbox.
Outlook 365 Not Receiving Emails
Beyond the personal-account checks earlier in this guide, business accounts should also consider:
- Mailbox status — an administrator can check whether the mailbox is disabled, over quota, or has a delivery restriction applied
- Microsoft 365 service health — checked from the admin center, not the individual user’s Outlook
- Quarantine — messages flagged as spam or suspicious are held here rather than delivered; users can typically view and release their own quarantined items unless the policy restricts that to admins
- Mail-flow rules and anti-spam policies — these can redirect, block, or hold messages based on sender, domain, or content
- External mail delivery settings at the organization level
If this problem started right after a mailbox migration — including a Microsoft 365 migration or an IMAP migration — mail-routing changes from that transition are worth checking too, alongside the causes above.
Outlook Work Email Not Receiving External Emails
An employee can usually check their own Junk folder, rules, and quarantine (if permitted). But if messages from outside the organization consistently fail to arrive — while internal mail works fine — that pattern points to organization-level mail-flow rules or anti-spam policy, which only an administrator with access to the Microsoft 365 admin center or Exchange admin center can diagnose and fix.
Outlook Still Not Receiving Emails? When to Get Help
Some issues genuinely require outside help rather than more troubleshooting on your own. Consider getting professional assistance when:
- Emails are consistently rejected or bounced with no clear cause
- External senders’ emails aren’t reaching a business mailbox, even after checking Junk and rules
- The issue involves Microsoft 365 quarantine or mail-flow rules you don’t have access to
- Multiple users in your organization are affected at once
- The account or mailbox configuration is unusually complex
- The problem started right after a migration, domain change, or DNS update
- Messages appear to disappear even though delivery looks successful
If your Outlook or Microsoft 365 account still isn’t receiving messages after these checks, Skymigrate can help diagnose email delivery, Microsoft 365 configuration, and mail-flow issues. Skymigrate also offers Microsoft 365 migration and IMAP backup and restore services for cases where the delivery problem is tied to a migration, DNS change, or mail-routing update rather than a single account setting.
Frequently Asked Questions
Why have I suddenly stopped receiving emails?
The most common causes are a full mailbox, messages being filtered to Junk, an inbox rule moving new mail, a sign-in or sync issue, or — for work accounts — a mail-flow or quarantine policy. Check storage, Junk, and rules first, since those account for most cases.
Why is Outlook not updating my emails?
This usually points to a sync issue rather than a delivery issue — Outlook isn’t actively checking the server for new mail. Confirm you’re not in Work Offline mode, check your connection, and try a manual Send/Receive.
Why isn’t Outlook showing me new emails?
If the messages have arrived but aren’t visible, check the Junk Email folder, the Other tab if you use Focused Inbox, and any active rules. If they haven’t arrived at all, the cause is more likely storage, blocked senders, or server-side filtering.
How do I force Outlook to update emails?
Use Send/Receive in desktop Outlook, refresh the browser in Outlook on the web, or pull down to refresh in Outlook mobile. If that doesn’t pull in new mail, check your connection status and confirm the account isn’t set to Work Offline.
Why are my incoming emails not showing up in Outlook Inbox?
They may have been filtered to Junk, redirected by a rule, or — for business accounts — held in quarantine by an anti-spam policy. Check each of these before assuming the message never arrived.
Why is Outlook blocking my incoming emails?
Incoming mail can be filtered at several points: Outlook’s Junk Email settings, blocked-sender and rule settings, and — for Microsoft 365 accounts — server-side anti-spam and mail-flow policies at the organization level.
How do I start receiving emails again?
Check mailbox storage, Junk Email, blocked senders, and rules first. If those check out, confirm your account is signed in properly and Outlook is actively syncing. For business accounts, ask an administrator to check quarantine and mail-flow rules.
Why is Outlook not refreshing new emails?
This is typically a sync issue — the app isn’t checking the server on schedule. Try a manual refresh, confirm your connection, and update or restart the app if the problem continues.
Why do I have to restart Outlook to receive new emails?
This points to a syncing problem in the app rather than a delivery issue, since the mail is clearly reaching your account. Updating or repairing the app, or removing and re-adding the account, usually resolves a recurring version of this.
