filter on addresses
It would be nice if we could easily sort mail based on the address it's delivered to for those who have several addresses for one account. Filtering on recipient does not suffice as sometimes you're addressed as BCC.
Fortunately a solution currently exist in using a sieve filter that checks for the address in the "Delivered-To" header. But in my view a significant use case for using different addresses is to easily sort email so this should be able to be done without writing a piece of code.

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Benoit commented
Really need this.
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AZ commented
This would be especially useful because I use one of my addresses as a work account.
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Not Given commented
I would really like to be able to filter by the proton mail address the emails were received to. This will support easier workflow on a task basis. If it was to integrate with simplelogin aliases too that would be great but not as critical as being able to filter by email address recipient amongst my proton email addresses.