We all get this. In my case. most of the bad stuff is either screened out by email providers' anti-spam systems (gmx and gmail are both very effective here) and most of the rest is identified as Junk by Thunderbird. Keep marking bad stuff as Junk (right-click, mark as, then junk or not junk as appropriate. Or use the keyboard; j marks as Junk, shift+j marks as Not Junk.) If you get to see spam as categorized by your providers, check it over (there will be false positives which you need to rescue) and mark the truly bad stuff as Junk. This should help hasten the training of your Junk filters as they are being provided with known spam and this will reinforce their recognition of the components common to spam and junk. Also you must check over your Junk for the same reasons, and mark as Not Junk anything that has been labelled wrongly as Junk. If you have a mix of Junk and good messages in a folder, you can sort on the Junk column to collect all the junk messages into one block. Then you can select that block using click and shift-click and delete many all in one action. More here on sorting and multi-selection: http://xenos-email-notes.simplesite.com/417754237