Don't group e-mails if there is a certain time in between them
Currently Proton Mail groups e-mails based on sender and subject regardless of when it was sent. This makes it difficult to distinguish between different threads.
For example, if I order something with my favourite webshop it sends me a generic confirmation mail with the same subject. They are all grouped together.
My suggestion would be if there is >24 hours between the e-mails, they are treated seperately. Similar to what Gmail also does.
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Anonymous commented
There is a similar uservoice idea, please give a vote for it here:
https://protonmail.uservoice.com/forums/284483-proton-mail/suggestions/36982315-add-conversation-threads