When i send mail a message come up. saying your message was not sent. suspicious activity has been dectected on your account. to protect your account and our users, your message has not be sent. if this error continues, please contact costomers care. wa appologise for the inconvenience.
I have yahoo personals and this person i am trying to contact liveshere in my town he sent me a note yesterday stating he is sending me messages and im not getting them and he is not getting mine i sent 4 yesterday without an answer from him he says they are going into cyber space i want help as this is what im paying for here thank you email@example.com
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Can you please take a screenshot of the error message and post it here? Looks like the problem is being triggered by your firewall or safe browsing plugin of your internet security pack but I need the complete error message. Also let me know the name of the internet securit software you are using.
Some internet companies will lock your account if you have sent out an unusually high volume of emails. This is to prevent spamming. If you haven't been sending an unusually high number of emails someone may have hacked your account. You will need to contact Yahoo to get this issue resolved.
First check your Sent Message folder, if you find any sent item that you haven't sent, then there must be something going on with your account, perhaps it's been hacked or with similar unauthorized access. If you find any suspicious activities, simply change the password and wait for another hours to make sure you don't receive another failed delivery message.
You also need to check your mail options such as your signature, in most cases, hacker/s changes the contents of the signature and the sender's name, etc..etc.. Probably they have inserted some texts in place of your signature. If you find so, delete them and save the new settings.
Let me know if you need further help, let me know.
This issue can be as a result of someone else other than you using your account, or it can be related to the emails you have sent or received recently.
According to the Yahoo! help information, when this occurs you should check to see if there is any suspicious activity on your email account. Also, change your Yahoo! email account password, just in case.
These messages will generally stay for around 48 hours, or two days. If you have received or sent many emails with attachments lately, remove some of them from your inbox or sent folder.
Also, try clearing your cache and cookies on your browser. This can be done by going to Tools -> Delete Browsing History... in Internet Explorer, or Tools -> Clear Private Data in Firefox.
Hope this is of help to you. Don't forget to rate this solution, and have a great evening!
Most probably, someone is using your account to send spam mail. First and foremost, CHANGE YOUR PASSWORD IMMEDIATELY. Use a strong password - with letters, numbers, symbols and long enough to make it difficult to guess. Also, notify Yahoo of the problem. Still, it may take a while before Yahoo "white-lists" you again. All the best.