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Email Connection Problems

If you are having trouble connecting to your email server, the first thing you should do is check your underlying Internet connection, for example by surfing some web pages you haven't visited in awhile, to make sure it really is a problem with your email. If you are setting up your email application for the first time or have recently changed your configuration, then also double-check your configuration settings, especially the server names, email address, and user name, since this is the most common cause of email connection problems.

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Malware Attack
Receive a "Mail Delivery Failure" notification for messages you did not send at all? It may well be that you've been under a malware attack: a virus is using your account to send spam emails – and that explains the origin of all the bounces you got.

The actual cause can be either a worm virus (run immediately your anti-virus) or the so-called spoofing: a spammer pretending to be you employing your address name. As it's quite difficult to avoid this kind of problem, you should consider to get an email authentication.

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Forgot password or  ID

Use the Sign-in Helper to get back into your account using your Yahoo ID, mobile number, recovery phone number, or recovery email address. If you forgot your password, be sure to change your password to a strong one that you'll remember after you're in.

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Bounces.

The simplest case is when you get a bounce: for instance, when the recipient's address is full (a soft bounce: just wait and re-send) or worst, when it's non-existent (a hard bounce: you need to remove the account from your list). In this case you simply receive an email from the incoming server – like the usual "Mailer-Daemon" or "Postmaster" alerts – informing you that the message has been discarded.