Updated August 2026

If your email won’t send, don’t worry.

This is one of the most common email problems and, in most cases, it’s easy to fix.

Whether you use Gmail, Outlook, Yahoo Mail or another email service, the problem is usually caused by a poor internet connection, a large attachment, or a temporary issue with your email app.

This beginner-friendly guide explains the most common causes and shows you exactly how to fix them step by step.

Quick Answer

Why won’t my email send?

If your email won’t send, the most common reasons are:

No internet connection
Attachment is too large
Email is stuck in the Outbox
Wrong email address
Email app has frozen
Mail server is temporarily unavailable
Email account storage is full

Most people solve the problem by checking their internet connection, waiting for attachments to finish uploading, or restarting their email app.

Before You Start

✔ You have not broken anything.

✔ This problem happens every day.

✔ Most email problems can be fixed in just a few minutes.

Simply work through the steps below one at a time.

1. Check Your Internet Connection

Emails need an internet connection before they can be sent.

Check that:

Wi-Fi is connected
Mobile data is switched on
Airplane Mode is turned off

If your internet isn’t working, reconnect and try sending the email again.

Checking Wi-Fi connection to fix an email that won't send

2. Check the Email Address

A simple typing mistake can stop an email from being delivered.

Look carefully for:

Missing letters
Extra spaces
Incorrect spelling
Missing @ symbol

Example:

✅ john@gmail.com

❌ john@gmial.com

3. Is Your Attachment Too Large?

Most email providers only allow attachments of around 20–25 MB.

Large photos, videos and PDF files may stop the email from sending.

Try:

Sending fewer photos
Compressing files
Splitting files across two emails

Helpful guide:

➡ How to Send Multiple Photos by Email

4. Wait for Attachments to Upload

Many people press Send before the files have finished uploading.

Look for:

Upload progress bar
Loading circle
Photo previews

Wait until uploading has completely finished before pressing Send.

Waiting for photos to finish uploading before sending an email

5. Check Your Outbox

Sometimes your email hasn’t failed—it is simply waiting to be sent.

Open your Outbox.

If the email is there:

Wait a few minutes
Press Send again
Edit and resend if needed

6. Restart Your Email App

Small software glitches happen.

Close the app completely.

Open it again.

Try sending the email once more.

7. Restart Your Device

A restart often clears temporary problems.

Turn your device off.
Wait 30 seconds.
Turn it back on.
Try sending your email again.

8. Check Your Email Storage

Some email accounts stop working if your storage becomes full.

Delete:

Large emails
Spam
Trash
Old attachments

Freeing storage may solve the problem immediately.

9. Is Gmail, Outlook or Yahoo Having Problems?

Sometimes the problem isn’t your device.

Your email provider may be experiencing a temporary outage.

If everything else looks correct, wait a little while and try again later.

10. Update Your Email App

Older versions sometimes develop bugs.

Open:

Google Play Store
Apple App Store

Install any available updates.

11. Sign Out and Back In

Refreshing your account often fixes syncing problems.

Sign out.
Restart your device.
Sign back in.
Try sending your email again.

12. Send Yourself a Test Email

Create a brand-new email.

Don’t attach any files.

Send it to yourself.

If it works, the original email probably contains an attachment or formatting issue.

Sending a test email to check if an email account is working

Frequently Asked Questions

Why does my email say “Failed to Send”?

Usually because:

your internet connection dropped
your attachment is too large
the email server is temporarily unavailable
the recipient’s email address is incorrect

Why is my email stuck in the Outbox?

This usually happens because your internet connection was lost while the email was uploading.

Reconnect to the internet and press Send again.

Can large photos stop emails sending?

Yes.

Large photo attachments are one of the most common reasons emails fail to send.

If needed, send fewer photos or reduce their size.

Why won’t Gmail send emails?

Common reasons include:

weak internet connection
oversized attachments
Gmail syncing problems
temporary Google server issues

Why won’t Outlook send emails?

Common causes include:

Outlook Offline Mode
oversized attachments
account syncing issues
temporary Microsoft server problems

Good to Know

Most email sending problems are temporary.

You haven’t damaged your email account.

Work through each step slowly and test your email after each fix.

In most cases, the problem is solved within a few minutes.