Thunderbird not able to send emails
I am currently using Mozilla Thunderbird: a free, open source, cross-platform email and news client .
I am trying to send an email using thunderbird but each time I fail and get the following error message on my screen:
Send Message Error
Sending of message failed.
There was an error attacking. Please check if you have access to the file.
There are 50 users who are running Ubuntu Server 10.04 LTS on a thin client environment. All are successfully sending and receiving emails except 1 user who is not able to send the email. He receives the above mentioned error.
Can anyone please guide me out of this problem?
Looking forward to your suggestions