If you logged on to your webmail account and changed your password then you would need to update the stored password in Thunderbird. * Settings > Privacy & SEcurity * Scroll down to 'Passwords' section * click on 'Saved PAsswords' * Click on 'Show Passwords'. You might get a pop up window saying 'Windows Security' and it asks for a password...when you start up computer and logon to your User Account - that is the same password you need to use. Then you can see your saved/stored passwords. There should be two lines one for incoming and one for outgoing. Both lines need the password updating. Pop accounts: 'mailbox://account.... Imap accounts: 'imap://acccount.... outgoing server: smtp://account.... * Right click on relevant line for the account and select 'Edit Password' * Completely clear old password and carefully type the new password. * when you have both incoming and outgoing - click on 'Close' * Exit Thunderbird - wait a few moments and restart Thunderbird. It will now use the updated password. ------------------------------------------------- However, if problem persists.... What OS are you using ? what version of Thunderbird are you using ? Do you use a Pop or Imap account? What does your email address end with...what is after the '@' ? Whatever is after the '@' in email address determines what server settings you have to use. It would be helpful to know what server settings you are currently using. Account Settings > Server Settings for the account. Upload an image showing settings on the left side. When you click on 'Get Messages' do you get an error message ? If yes, what does it say - either upload an image showing the error or type the error message word for word verbatim into this forum question. check computer: VPN - do you have a VPN operating ? Servers do not like VPN as it hides IP address so server can think you are a hacker and block access. Check your Anti- Virus program because many now offer a VPN and one may have enabled without your knowledge. Switch off VPN.