How to Fix Email Messages That Are Not Sending or Receiving

When email stops working, the cause is usually one of a few common problems: a weak internet connection, an incorrect password, a full mailbox, an attachment that is too large, an app-sync failure or a temporary issue with the email provider.

This guide explains what to check when you cannot send or receive messages on Gmail, Outlook, Yahoo Mail, a work account or another email service. The steps are suitable for beginners using Android phones, iPhones, tablets, Windows computers or a web browser.

First, identify the exact problem

Before changing settings, establish what is failing. Try these quick tests:

• Can you open other websites or apps using the same internet connection?
• Can you log in to your email through a browser?
• Are messages failing to send, failing to arrive, or both?
• Do you see an error message such as “authentication failed”, “mailbox full” or “connection timed out”?
• Is the problem affecting one device or every device connected to the account?

If email works in a browser but not in the mobile app, the account is probably fine and the app or device needs attention. If it fails everywhere, focus on the password, storage, account access or email provider.

Check your internet connection

Email may remain stuck in an Outbox when the internet connection is weak or disconnected. This is especially common when moving between Wi-Fi and mobile data.

1. Open a webpage or another internet-based app.
2. If you are using Wi-Fi, turn Wi-Fi off and test mobile data, or connect to a different network.
3. If you are using mobile data, check that data is enabled for your email app.
4. Turn Airplane Mode on for about 10 seconds, then turn it off.
5. Restart the phone, tablet or computer if the connection remains unreliable.

On a computer, a VPN, firewall or workplace network may also interfere with email connections. Temporarily testing a different network can help identify whether the network is responsible.

Try email in a web browser

Open the official website of your email provider and sign in directly. For example, use the provider’s legitimate website rather than a link from an unexpected message.

This test separates account problems from app problems:

• Browser works, app fails: update, restart or re-add the account in the app.
• Browser also fails: check your password, account security alerts, mailbox storage and provider status.
• You cannot sign in: use the provider’s official password-recovery process. Never give your password, one-time code or recovery information to someone claiming to be support.

Check whether your mailbox is full

Many email services stop accepting new messages when the account’s storage limit has been reached. Some providers combine email storage with files, photos or other services.

Delete unnecessary messages, especially those containing large attachments. Then empty the Trash and Spam folders, because deleted messages may continue using storage until they are permanently removed. If the provider offers a storage-management page, use it to find the largest files and messages.

After freeing space, allow some time for the account to update before asking someone to send the message again.

Inspect the Outbox, Drafts and Spam folders

A message that did not send may be waiting in the Outbox. Open it and look for the displayed error. A message with a large attachment may remain there until the attachment is removed or replaced with a smaller file or cloud-storage link.

If you are waiting for a message, check Spam, Junk, Promotions and other filtered folders. Also search for the sender’s address or a distinctive word from the subject line. Confirm that the sender has your correct address; one missing character can send a message to someone else.

Confirm the recipient and attachment

Send a simple test message to yourself with a short subject and no attachment. This helps determine whether the problem is caused by the particular recipient or file.

Common causes include:

• An incorrect or incomplete recipient address.
• Several recipients entered with the wrong separator.
• An attachment that exceeds the provider’s limit.
• A file type blocked by the recipient’s mail server.
• A message containing suspicious links or content that triggers filtering.

If the test message works, send the original message in smaller parts or share the file through a trusted cloud-storage service. Do not use unknown file-sharing links for sensitive documents.

Check your password and account security

Email may stop working after you change your password, enable two-step verification or remove access for an older app. The app can continue trying to use an old password and repeatedly fail.

Sign in through the provider’s official website. If prompted, review recent sign-in activity and security alerts. Change your password only through the official account settings or recovery page. A strong password should be unique to that email account.

If two-step verification is enabled, the email app may need an approved sign-in or, for some older email programs, a provider-specific app password. Follow the provider’s own instructions rather than copying settings from an untrusted website.

Update or repair the email app

An outdated or corrupted app can prevent messages from synchronising.

On Android

• Update the email app from the official app store.
• Check that background data and notifications are allowed.
• Open the app’s account settings and confirm that synchronisation is enabled.
• Restart the device.

On iPhone or iPad

• Check for an app or iOS update.
• Review the account under Mail settings and confirm that Mail is enabled.
• Check Fetch New Data settings if messages are arriving late.
• Restart the device.

On either type of phone, removing and adding the account again can fix synchronisation. Before doing this, confirm that your messages are stored on the provider’s server and that you know the correct sign-in details. Do not remove an account if you are unsure whether important messages exist only on the device.

Check computer email settings

Programs such as Outlook, Apple Mail and Thunderbird use incoming and outgoing mail-server settings. A wrong server address, port, encryption method or username can prevent sending or receiving.

Compare the settings with the email provider’s official help page. The incoming server may use IMAP or another supported protocol, while outgoing mail normally uses SMTP. Avoid guessing port numbers or disabling encryption simply because a connection fails. Incorrect settings can expose your account or cause repeated login errors.

If this is a work, school or website-hosting email account, contact the organisation’s administrator or hosting provider. The account may have server-side limits, a disabled mailbox or a domain configuration problem.

When the problem is on the recipient’s side

If you receive a bounce-back message, read the reason carefully. It may indicate that the recipient’s mailbox is full, the address does not exist, the receiving server rejected the message or the message was blocked as spam.

Check the address and resend a plain-text message without links or attachments. If the bounce message says the receiving server rejected your email, contact the recipient through another trusted channel. Do not repeatedly resend the same message, as this may make filtering more likely.

When to contact support

Contact the email provider, employer, school or hosting company when:

• You cannot recover the account through the official process.
• The mailbox works nowhere, even with a reliable connection.
• Your account shows suspicious activity or unauthorised changes.
• Messages disappear, are delayed for a long time or generate repeated server errors.
• A custom-domain address stopped working after a website or hosting change.

When contacting support, provide the error wording, approximate time of the failure, device type, app or browser used and whether webmail works. Do not send your password, PIN, one-time password, recovery code or full email contents unless the provider specifically requires safe diagnostic information.

A simple troubleshooting order

For most users, the fastest sequence is: test the internet, try webmail, check Spam and Outbox, confirm storage, send a small test message, verify the password, update the app and then review account or server settings. This order prevents unnecessary changes and makes it easier to find the real cause.

For Nigerians using email for job applications, school opportunities, business, banking notifications or travel documents, reliable access matters. Keep a recovery phone number or alternative email updated, save important attachments securely and use only official account-recovery pages. If a message is urgent, confirm delivery through a separate trusted channel rather than assuming that a sent message was received.

The key is to diagnose before changing settings. A browser test, a small self-addressed email and the exact error message will usually show whether the fault is with your connection, device, account, message or the recipient’s server.