When email stops working, it disrupts your entire workflow — missed messages, bounced replies, login errors, and sync failures can all have different causes. This guide covers the most common email problems and their fixes for all major providers: Gmail, Outlook/Microsoft 365, Yahoo Mail, Apple Mail/iCloud, and business email (IMAP/POP3).
Identify Your Email Problem
Can't log in to email
Password issues, account locked, or 2FA problems. See Fixes 1-2.
Not receiving emails
Check spam, filters, mailbox quota, and server settings. See Fixes 3-5.
Can't send emails
SMTP settings, authentication, or ISP blocks. See Fixes 6-7.
Email not syncing
App sync, IMAP settings, or account configuration. See Fixes 8-9.
Fix 1: Reset Your Email Password
If you can't log in, use your provider's password reset:
- Gmail: accounts.google.com → "Forgot password" → verify via phone or recovery email
- Outlook/Hotmail: account.live.com → "Forgot my password" → verify identity
- Yahoo: login.yahoo.com → "Forgot password" → verify via phone
- Business email: Contact your IT department or hosting provider to reset
Fix 2: App Passwords for Two-Factor Authentication
If you use 2FA (two-factor authentication) and your email app keeps asking for a password, you need an App Password. Regular passwords don't work with 2FA in email clients. Gmail: Go to myaccount.google.com → Security → App passwords → generate one for your email app. Outlook: account.microsoft.com → Security → App passwords. Use this app password instead of your regular password in email client settings.
Fix 3: Check Spam/Junk Folder
Missing emails are often in your Spam or Junk folder. Check it first. If you find legitimate emails there, mark them as "Not Spam" to train the filter. Also check if you have any email rules/filters that auto-move or auto-delete messages — in Gmail, go to Settings → Filters and Blocked Addresses; in Outlook, Settings → Rules.
Fix 4: Free Up Mailbox Space
If your mailbox is full, new emails bounce back to senders. Gmail: 15 GB shared with Google Drive and Photos. Outlook.com: 15 GB. Yahoo:1 TB. Empty your Trash and Spam folders first — they count toward your quota. Delete emails with large attachments (search for "has:attachment larger:10M" in Gmail). Download important attachments to your computer, then delete the emails.
Fix 5: Check Email Server Status
Before troubleshooting further, check if your provider is having an outage: Visit DownDetector.comand search for your email provider. Google, Microsoft, and Yahoo all have occasional outages. You can also check: Google Status Dashboard (for Gmail), Microsoft 365 Status (for Outlook), or your hosting provider's status page for business email.
Fix 6: Correct SMTP/IMAP/POP3 Settings
If using an email client (Outlook desktop, Thunderbird, Apple Mail), incorrect server settings cause sending/receiving failures:
| Provider | IMAP Server | SMTP Server | Ports |
|---|---|---|---|
| Gmail | imap.gmail.com | smtp.gmail.com | IMAP: 993 / SMTP: 587 (TLS) |
| Outlook | outlook.office365.com | smtp.office365.com | IMAP: 993 / SMTP: 587 (TLS) |
| Yahoo | imap.mail.yahoo.com | smtp.mail.yahoo.com | IMAP: 993 / SMTP: 465 (SSL) |
| iCloud | imap.mail.me.com | smtp.mail.me.com | IMAP: 993 / SMTP: 587 (TLS) |
Fix 7: Fix Email Not Sending
- Check that SMTP authentication is enabled in your email client settings
- Use port 587 with STARTTLS instead of port 25 (many ISPs block port 25)
- Reduce attachment size — most providers limit to 25 MB. Use cloud sharing for large files
- Check your Outbox — emails may be stuck there. Delete stuck messages and try again
- For Outlook-specific sending issues, check our dedicated guide
Fix 8: Fix Email Not Syncing on Phone
- Verify you have a working internet connection (try loading a website)
- Force close the email app and reopen it
- Check that email sync is turned on: Settings → Accounts → your email → enable Sync
- Set sync frequency to as items arrive or every 15 minutes
- Remove the account and re-add it (this creates a fresh connection)
- Update the Gmail/Outlook/Yahoo app from the App Store or Google Play
Fix 9: Remove and Re-Add Email Account
When nothing else works, removing and re-adding the email account forces a completely fresh setup. Outlook: File → Account Settings → select account → Remove → Add Account. iPhone: Settings → Mail → Accounts → select account → Delete → add again. Android: Settings → Accounts → select email → Remove → re-add.
Frequently Asked Questions
Why am I not receiving emails?
Common reasons: (1) Mailbox is full — delete old messages or empty trash, (2) Emails are going to Spam/Junk folder, (3) Email filters are auto-deleting or archiving messages, (4) Sender's email is getting bounced — ask them to check their Sent folder, (5) Server issue on your provider's end — check their status page, (6) Incorrect email forwarding rules redirecting messages elsewhere.
Why can I receive but not send emails?
Sending failures are usually caused by: (1) Your outgoing mail server (SMTP) settings are wrong, (2) Your ISP is blocking port 25 — switch to port 587 with TLS, (3) Authentication issue — re-enter your password in account settings, (4) Attachment too large — most providers limit to 25MB, (5) Your email was flagged for suspected spam — happens with mass emails or certain content.
Why does my email keep asking for password?
This means your email client lost its authentication: (1) Password was recently changed — update it in the email app, (2) Two-factor authentication was enabled and the app needs an App Password instead, (3) Less secure apps access was turned off (Gmail), (4) OAuth token expired — remove and re-add the account. For Gmail and Outlook, you may need to generate an 'App Password' from your account security settings.
How do I fix email not syncing on my phone?
Steps: (1) Check internet connection — WiFi or mobile data, (2) Force close the email app and reopen, (3) Check sync settings — make sure email sync is turned on, (4) Remove the account from the phone and re-add it, (5) Update the email app from your app store, (6) Check if the email provider is having an outage.
Why are my emails going to spam?
Your sent emails may land in spam if: (1) Your email address is on a blacklist, (2) Email content triggers spam filters (too many links, certain keywords), (3) SPF/DKIM/DMARC records are not set up for your domain, (4) You're sending to many recipients at once, (5) Recipients previously marked your emails as spam. For business email, ensure proper DNS records (SPF, DKIM, DMARC) are configured.
Email Still Not Working?
Our technicians can remotely configure email accounts, fix SMTP settings, and resolve sync issues.