re: ''I tried using the FILTERING tool in Thunderbird, but without success'' Tools > Message Filters * Filters for 'Select the mail account' if not already selected. * click on New * give filter a name Apply filter when: * select 'Manually run * select 'Getting new mail' * select 'Filter before Junk Controls' * select 'match all of the following' Set condition: * 'FROM' and 'IS' or 'Contains' and email address of person Perform these actions: * 'Move message to' and choose the account and folder. You could move it to the Junk folder allowing you the opportunity of viewing the email just in case it is a good email. Up to you. If you want to just delete it, then select 'Delete Message' instead of 'Move Message to'. * click on OK to create the filter. Make sure the email is positioned at the top of the list, as the top filter works first. If it is positioned lower down, that email may get filtered by another filter and move from Inbox before the actual filter you want to use is called. So the email is not removed/moved because it was not there. Finally, make sure the filter is enabled.