When emails won’t send, start by ensuring you have a strong internet connection, as a weak or intermittent connection can prevent emails from leaving the outbox. Check your email server settings, particularly if you recently updated your email app or account password; incorrect settings can block email from sending. Look at the size of your email attachments—most providers have a limit (often around 20-25 MB); compress or remove large attachments if necessary. Additionally, check the outbox for any emails that are stuck and manually delete or resend them. If none of these steps work, logging out and back into your email account or reinstalling the email app can often fix deeper issues.