Avaliado com 5 de 5 estrelas

por turbodent em Jan. 29, 2021 · ligação permanente

I used to LOVE this when it worked, thanks to the author for all these good years... :)
For those interested in a similar solution, you may want to look into BorderColors D
https://addons.thunderbird.net/en-GB/thunderbird/addon/bordercolors-d/?src=search