Someone is abusing your email address. Do not respond to any of these emails. Do not click on any links etc in the email. Delete the emails. The trouble is that many of your contacts may also be receiving these emails thinking they are from you. The abuser may simply just be using your email address, but as it is unknown what may have occurred, I would suggest you consider the following: Backup Thunderbird Profile. Run scan on computer. Change webmail password. Update password in Thunderbird Suggest: Create a signature html file and attach to your outgoing messages. Send email to your contacts using the signature, tell them someone is abusing your email address, say your sorry they may have received such an email and that in future all emails from you will have a signature, so that they can tell the difference. Tell them not to repond to any email from you that does not have the signature. Eventually, the abuser usually gives up on that email address if there were no responses. '''Info on Baclup:''' * http://kb.mozillazine.org/Profile_backup '''Info on updating password:''' * Logon to webmail account using browser and change password. * Logout and logon again to check new password works ok. * In Thunderbird * Tools > Options > Security > Passwords tab * click on 'Saved passwords' buton * click on 'Show Passwords' button * select/highlight both mailbox and smtp for the account * click on 'Remove' * click on 'Close' * click on OK to save chnages to options. * Close Thunderbird and wait a few moments to allow TB to fully close processes. * Restart Thunderbird and at the prompt enter the new password. * Select the checkbox to allow Password Manager to remember the password * click on OK '''Info on creating html signature files:''' * https://support.mozilla.org/en-US/kb/signatures#w_signatures-stored-in-files * http://kb.mozillazine.org/Signatures_%28Thunderbird%29