why is my mail not sending

There are a few different things that could be causing your mail app to be unable to send messages. Here are a few things you can try to troubleshoot the issue:

1. Check your internet connection: Make sure that you have a strong internet connection. If you are using a cellular data connection, try switching to Wi-Fi or vice versa. You can also try turning your internet connection off and on again to see if that helps.
2. Check your account login: Make sure that you are logged into your email account in the mail app. If you have recently changed your password, you may need to enter your new password in the app.
3. Check your account settings: Go to the "Settings" app on your iPhone and select "Passwords & Accounts." Make sure that the settings for your email account are correct.
4. Check for updates: Make sure that you have the latest version of the mail app and that your iPhone is running the latest version of iOS. You can check for updates by going to the "General" section in the "Settings" app and selecting "Software Update."

If these steps do not help, you may need to contact your email provider for further assistance. They will be able to help you troubleshoot the issue and find a resolution.