How can we improve ProtonMail?

Improve addressing with extension character; allow hyphen (-); use correct sender address.

1. Add the use of a hyphen (-) as the extension character, in addition to plus (+). Reasoning is below.

2. When a message arrives for example-bob@protonmail.com, replies sent by the recipient should automatically show example-bob@protonmail.com as both the header sender and the envelope sender. The reason should be obvious.

Why hyphen (-) in addition to plus (+). The use of plus (+) tells people that you are using an extension, while the use of hyphen (-) makes the address look like an ordinary address.

Many buggy websites reject email addresses that contain a plus.

For additional reasoning see the original documents that were published by Dan Bernstein when he wrote qmail in the nineteen nineties, and chose to use a hyphen rather than a plus.

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