Add option to reject emails based on sender
I would like the option to reject emails from specific senders.
Specific email addresses or domains could be added to a blacklist.
Senders in the blacklist would be under two categories:
(A) Blocked
(B) Appear as Blocked
(A) If an incoming email is from a sender in the "Blocked" group the server would send an "undeliverable" message to the sender and the sender's email would not appear in my Inbox or my spam box at all.
(B) If an incoming email is from a sender in the "Appear as Blocked" group the server would send an "undeliverable" message to the sender but the sender's email would still appear in my Spam box.

ProtonMail currently offers the ability to filter your email as it arrives. You can add sender’s emails to a blacklist to have them automatically moved to the spam folder: https://protonmail.com/support/knowledge-base/spam-filtering/
You can also filter your messages with the more advanced filter functionality found here: https://protonmail.com/support/knowledge-base/sieve/
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James commented
Definately allow this feature. I prefer (B). Send the reject message but let us still see the message in our inbox.
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Anon commented
That would be awesome!
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Mike commented
Similar to email rules which can be created in Outlook, I would like the option for incoming emails from specific emails searched for keywords such as 'special offers' and have that moved to spam.
In a more general sense, it would be handy to have customisable rules so that when you get an incoming message, an automated action such as flagging the message as important or sending it to spam can be set based on certain criteria such as the email content or email sender.
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Administrateur commented
I would love this. It would keep a few ppl I don't want to respond to away from me.
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Rick commented
@OtherPerson: How's that? The blocking would be done at the user level!
If I add annoying.user@domain.com to my own black list, how's that going to put all domain.com users at risk of being blocked by "some services"? -
otrapersona commented
I'd be careful implementing this feature, lots of potential for mischief that would bring bad consequences for all users. For instance, some people used their riseup emails for spam and now some services blocked all riseup mails (not only for receiving, but also for sending).
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Jay commented
PM, please add this.
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Dennis commented
I would love to see this feature as well. I receive a couple emails from someone who just won't go away. I have to keep deleting them manually. This would solve that issue. I thought about just getting another account and abandoning this one, however Protonmail is not my primary email and it would be such a pain to start again.