Whenever I try to send an email from Thunderbird on one of my Force9 (PlusNet) accounts, I get an error message like this (1st image). Retry gives an endless cycle of the same message. Enter New Password gives an opportunity to enter a new password, resulting in the same error message. Cancel gives the 2nd image. ISP Plusnet Broadband provider Virgin Operating System Windows 11 Thunderbird version 91.9.1 Please help! Thanks Andrew