Allow users to NOT choose a default sending address.
This should be very easy. On the page https://mail.protonmail.com/account, near the bottom is a section titled "Address Priority." Whichever address is dragged to the top becomes the default sender address. Simply add an extra but invalid email "address" to the list, with a name something like "No Default." If the user drags "No Default" to the top of the list, then he will be required to manually choose which address to send from.
I feel like this is a very important feature for the actual physical security of some members who may be emailing messages, from politically repressive areas, which could put them in actual physical danger. If someone is in a hurry, and forgets, and accidentally uses the default email (which may be tied to his actual identity) this could be a terrible and costly mistake.
This should be a very simple feature to implement. Just add the invalid email address, labeled "No Default" or "Manually Select" or whatever, to the list. Since it's an invalid email address it won't allow the user to send, until he or she chooses one of the other valid addresses.

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dave commented
I would love this option. All advantages of different addresses for different people are compromised if everyone eventually ends up getting your default one.
And you only have to forget to alter the From: field once and then your default email is in their address book forever with a 50/50 chance of them using it every time they email.
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Rod Barnes commented
Or, another option would be to allow multiple inboxes based upon the address and allowing to set the default email From address for that inbox. This seems like an extension of the rules model as incoming mail would come into an inbox (a folder) based upon the rule that determines delivery for that To (incoming) email address. By selecting a given inbox, it would use the email address set up as the default for that inbox.
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Rod Barnes commented
For users transitioning from a model of multiple email accounts (all with a single address -- and, thus, never had a reason to check the From address before sending) to a model of a single account (with multiple email addresses), something here would be very, very, helpful.
I'm one of those who have had 10+ email addresses in the Google model but each was a separate account; I never bothered to check the From address; it was implicit in working in a given account.
Having ditched Google and come over to Proton, I now have a single account with multiple addresses -- and have, more than once, sent an email with a From address (the default) which was not what I intended.
In my case, I use particular email addresses for communicating with particular categories of people/companies. (Otherwise, what is the purpose of having multiple email addresses?) Being forced to select the from address at the time of creating/sending the email would be a real help to keep me from forgetting to check before hitting send.
BTW: I really like the idea of the check box to have NO email selected by default when creating new email.
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Great Afoofum commented
As a S/W and Web Developer with UX knowledge/experience, I disagree with the premise of this request. One should always have a default sending address. However, that address shouldn't change (be remembered for anything other than the thread) when one chooses a different address. If that happens, then there's definitely a bug.
I'm going to second John's suggestion of having a checkbox for this.
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John commented
Another simple way to implement this would be with a simple check box to select/deselect whether or not new emails would automatically use a default email. SO SIMPLE, AND COULD POTENTIALLY SAVE LIVES!
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Andrew S. commented
Definitely worth the tiny effort to implement, unless anyone can think of an objection strong enough to weigh against users' lives.
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Anonymous commented
I definitely agree!
Thank you for such a great suggestion - I rarely remember to double check and it is so unprofessional to send a business related email with my personal/family address. -
Anonymous commented
This is probably not a very sought-after feature, but would probably be VERY easy to add, and would DRAMATICALLY enhance the user's security by making it very unlikely that the user would send an email from the wrong sender address.
Please add this!
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Luigi Calamar commented
This is a GREAT idea. I have multiple addresses and invariably I forget to select the correct one - and the default is used.