thanks you about topic "Problems sending email in outlook".I am using gmail and usuall use outlook check and concent my.
If you are using Outlook, or Outlook Express - you need to make sure in the account setup, that the box for "My server requires authentication" is checked and that the "Use same settings as my incoming mail" radio button is checked. (All of this is on the "servers" tab in the account setup). Try to "receive" or "check" mail before trying to send your email again.