@jacadcaps : No problem Okay it starts now, doesn't seem to work with my imap server though ! When adding it, it tries for a minute or two then gets back to the wizard (SSL/TLS).

I use the server specified here : https://docs.yulpa.io/hosting-shared/emails-zimbra-open-source/configuration-thunderbird

imap.web4all.fr / imap-zose.yulpa.io (same one, new name, as it used to be a non-lucrative association which turned into a small company)

I can create a test account for you, please let me know by email ! my nickname [at] free [dot] fr !

Thanks so much :)

[ Edited by mahen 22.08.2020 - 23:23 ]