Why Won't My Email Send? (And Why Aren't New Ones Showing Up?)

You hit send, and the message just sits there in your outbox. Or a friend insists they emailed you three days ago, and nothing ever showed up. Before you assume your account is broken, know this: email trouble almost always comes down to one of a handful of usual suspects, and most of them take two minutes to fix once you know what to look for.

Start with the basics

It sounds obvious, but it catches more people than you'd think. Make sure your phone or computer actually has a working internet connection, try loading a website and see if it comes up. On a phone, check that Airplane Mode is not switched on and that you have a solid Wi-Fi or cellular signal. If you use an email app rather than checking email through a web browser, make sure the app is fully open rather than sitting in the background, and give it a few seconds. Email apps typically check for new mail every so often rather than the instant it arrives, so a message that just landed may not show up for a few minutes.

Your password may have quietly stopped working

If you send and receive email through an app, such as Outlook or your phone's built-in Mail app, rather than logging into Gmail or Yahoo directly through a web browser, there is a specific problem worth knowing about. Big providers like Google now require extra security called two-factor authentication, which sends a code to your phone whenever you sign in somewhere new. Once that is turned on, some outside apps can no longer use your regular password to connect. Instead, you need to generate a separate app password, a one-time code made just for that app, and enter it in place of your normal password. This is not a scam or a mistake on your part. It is a newer, more secure way for outside apps to connect to your account. If email in an app stopped working right after you changed your password or turned on extra security, search your provider's help site for app password and set up a new one for that app.

Check if you, or the other person, are simply out of storage room

Every email account has a storage limit. A free Gmail account, for example, gets about 15 gigabytes shared between email, Google Photos, and Google Drive. Once that fills up, you cannot send or receive anything until you clear space or pay for more storage, and you may see a message mentioning your account being over its limit. This works both ways: if the person you are emailing has a full inbox, your message can bounce back to you as undeliverable even though nothing is wrong on your end. A message stuck in your outbox specifically is often a large photo or video attachment struggling to upload over a slow connection. Try switching to a stronger Wi-Fi connection, or remove the attachment and send it separately as a smaller file.

It might not be missing, just hidden

If someone insists they sent you something and you cannot find it anywhere, check your Spam or Junk folder before assuming it is lost. Spam filters are computer programs that guess which emails are unwanted based on things like the sender's reputation, certain words, or links in the message, and they are not perfect. A legitimate email from a new sender, or one with a link or attachment, can occasionally get caught by mistake. If you find it there, mark it as not spam so future messages from that sender land in your inbox normally.

An outdated app can quietly cause problems

Email providers regularly update the technical rules their servers use for security. If your phone or computer's Mail app has not been updated in a long time, it can stop communicating properly with the server, even though everything looks normal on your end. Check your phone or computer's app store for pending updates to your Mail app, and install them.

If you have worked through all of this and email still is not behaving, it is reasonable to contact your provider's support or ask someone tech-savvy to take a look. But the overwhelming majority of send and receive problems trace back to one of the causes above, and now you know exactly where to check first.