Hi,

I am using Mozilla Thunderbird 1.5. It has been working fine until
today. I can receive e-mails but when I send an e-mail, I receive a
message that says "An error occurred while sending mail. The mail
server responded: sender requires authentication. Please verify your
email address is correct in your Mail preferences and try again."

I have checked the mail preferences and they look correct. Is there
something that I have done wrong or somewhere else that I need to
check.

Thanks,
LS

lekosmoth@yahoo.com wrote:
> Hi,
>
> I am using Mozilla Thunderbird 1.5. It has been working fine until
> today. I can receive e-mails but when I send an e-mail, I receive a
> message that says "An error occurred while sending mail. The mail
> server responded: sender requires authentication. Please verify your
> email address is correct in your Mail preferences and try again."

The server you are using doesnt like what you are doing.

Best guess why: You arent authenticating to it. Check the button which
says authenticate.

However, the only people in the proper position to you are the
administrators of that server. Contact them.