why haven't i received e-mails since thursday a.m. and my sent e-mails are not being recorded?

[xander]

Hi Arnold,

It's possible that your account may have been compromised. I highly advise that you change your password right away. That is the first and most important step in re-securing your account:

"Changing your password"
http://help.yahoo.com/kb/index?page=content&id=SLN2035

After you change your password be sure to follow the steps in this Yahoo Help article to finish re-securing your account by checking for any changes that may be preventing mail delivery or messages being saved in the sent folder:

"Securing a hacked Yahoo account"
http://help.yahoo.com/kb/index?page=content&id=SLN3516

This Yahoo Help article has more information on some of the way accounts can be put at risk:

"How an account can be hacked"
http://help.yahoo.com/kb/index?page=content&id=SLN2551

For more tips you can use to keep your account safe I would highly recommend this Yahoo Help article:

"Safeguarding your Yahoo account"
http://help.yahoo.com/kb/index?page=content&id=SLN2080

Thanks!