It appears from amessage I received from yahoo that they think I may be a spammer. How do I prove I'm not and never have been one of those people. Now I can't send messages.to my friends.

please check the service centre number in text message settings

Unsolicited junk e-mail, or spam, is an unwelcome and often offensive byproduct of the Internet's success. Although there's no guarantee you can avoid all spam, there are ways to avoid looking at most of it.Instructions

1. Basic prevention
   • 1 If you're already getting spam messages, check with your Internet service provider to see whether it has a spam-prevention option that scans your incoming e-mail for known spammers.
     
   • 2 If you're lucky enough not to be getting spam now, then sign up for a second (free) e-mail address from a service such as Yahoo or Hotmail. Use this address exclusively for e-commerce, mailing-list subscriptions and bulletin-board postings of any kind. Reserve your main e-mail address for private e-mail to and from friends.
     
   Rule filtering
   • 1 Create an e-mail folder called Suspected Spam.
     
   • 2 Use the filtering feature in your e-mail program to create rules that redirect spam messages to your Suspected Spam folder. Most spam is not addressed to its recipient by name.
     
   • 3 Define a rule for incoming mail that says, "If my name appears in the To: or cc: field, then move this message to the Inbox." The procedure for defining rules varies among e-mail programs, so you should consult your program's Help feature to learn exactly how this works.
     
   • 4 Define individual rules to catch e-mail that isn't addressed to you personally but that you nevertheless want to receive, such as messages from lists you've subscribed to. Have these rules redirect the relevant messages to the Inbox or to special folders that you have created for mail from those sources--for instance: "If the Sender field includes 'MyList,' then send this message to the MyList folder."
     
   • 5 Define a final rule that sends all other e-mail that hasn't already been redirected by one of your other rules to the Suspected Spam box. For instance, a rule that says, "If the Sender field isn't 'XYXYXYXYY,' then move this message to the Suspected Spam folder" would work as a catchall.
     

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• Never reply to a spam message, even to request that your name be removed from the list. That just tells the spammers that your address is valid.
  

Frankly I don't very much think you'll be able to get your stuff back since you at this point won't have anything to prove who you are with. However (i'm not sure with yahoo but) some e-mail services can give you your account back if you give them information like previously passwords, the ip or provider where the email was created on, when it was created etc etc.
You can try using this site: https://edit.yahoo.com/forgotroot or calling themYahoo! Customer Service 408-349-1572

Usually there are several reasons why it happens the way it happened :
1) Someone is trying to gain access & lock your account. 2) A person tries to guess your password & ID by attempting more than 3 times or so.
But no worries, it's a normal security precaution which will eventually locked the account to prevent the unauthorized user from getting in successfully. This lock down usually will last 24hours after the failed attempts made by the unauthorized user. Go to this main Yahoo! logging site & insert the correct ID & password of your account. The first attempt may prove failure, second attempts will lead you to the "word verification system" which is to make sure that you are not "bots". Follow all those procedures provided by Yahoo!. 48hours after visiting that Yahoo! main logging site, your account should return as normal.
**NOTE: Remember to clear out your ID every time signing out of any sites that preserve your personal informations such as Facebook, Yahoo! Messenger @ Mail & etc. to prevent them from being hack or so.

What do you mean by "sending emails out that you did not write"? Did somebody inform you that they received an email from you, but you did not actually write it?

If yes, then I believe that you are not the one who sent that email. It is a spammer who did that. This is one of the common tactics of spammers to hide their true origin. But there's no need for you to worry. Because your email address has not been compromised. It's just that the spammer used your email address to spam other people.

However, Yahoo! has a spam filter, and I'm sure that there will come a time that Yahoo! admins will trace these illegal activities.

Thank you and good luck!

Is the email with the photo in your spam folder? Yahoo won't display images from senders that it thinks are spammers. Try moving the email to your inbox and viewing the photo.

Yahoo Phone Numbers and Contact Info @ http://www.answerbag.com/q_view/7646

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.

If it's with in the past two weeks Usually your companies System admin can track the delivery of incoming and out going messages. They will not be able to say that the message was delivered to your inbox but they will be able to say if it reached yahoo's server!

Unfortunately there is no way to prove you never received the message. Show them your inbox and trash folder and just try to convince them. Tell them it is possible for email messages to be lost in transit.