nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqacelflmaz95aefe8s2vmhyrluzafnpvru4gludwfg4rcp7pvpccs75jr40 I'm using Evolution for email on Linux, Vivaldi for browsing everywhere. On Mac just the default Apple Mail client.
Discussion
Do you have any additional information regarding the collaboration? Would love to read more about it :)
I use protonmail. It's not fully open source, but the use of one email adress is free of charge. I like that they put privacy first.