Also if a certain number of different Proton users (say 3 or 5) mark any sender as Spam, that it is universally blocked, so that all of us are protected from that sender. In this way we will weed out a lot of spam for all users.

For now, you can use contact groups & a sieve filter to replicate such a feature:

1. Go to the contacts page (https://mail.protonmail.com/contacts) and create a group called "Blocked".
2. Add any contacts/addresses you want to block to the group.
3. Go to Settings -> Filters (https://mail.protonmail.com/filters)
4. Click on "Add Sieve Filter", right next to the Add Filter button.
5. Paste the following code snippet to the pop-up:

require ["envelope", "extlists"];

if envelope :list "From" ":addrbook:personal?label=blocked"
{
discard;
}

This snippet discards (deletes) mails coming from contacts that are in the "Blocked" group.

6. Click on the "Save" button.

You can learn more about Sieve filters here: https://protonmail.com/support/knowledge-base/sieve-advanced-custom-filters/

Please....a BOUNCE BUTTON. I upgraded to plus but cannot make head nor tail of Sieve instructions. I need to block certain people...they are now blacklisted, so will go into spam, but seeing as I have to delete spam folder, I will know that they are still trying to hound me.
This has been asked for many, many times and over a long period of time.

Please....tell me why this is not a feature?

Should be able to select individual emails and just click "bounce"

Tutanota.com has this feature, where people can type a address and decide what to do with it.

That way it can clean out my SH*T in my inbox.

This is a very important feature any email account should have implemented. I can't keep my premium account if this feature will not be added in the future. Protonmail is a great service and I have recommended it to all my friends.

Have a feature to block spam (i.e. return error message to sender as if address doesn't even exist), as opposed to blacklisting it to spam folder.

I have been receiving email scam/bitcoin threats to custom business email. \is it possible to block selected email addresses

Amen, amen!! Sending unwanted email into the spam folder is NOT good enough!

When are you going to provide an actual block function? That is, when are you going to provide the means to actually block (stop all email) from even entering one's account. Not even make it into the spam folder, but make it bounce back to the address it was sent from?

There are nasty people in this world & I'm related to at least one & I don't want any of their email being able to get anywhere near my account!

a current easy fix for this is just send the e-mail you want blocked to spam, that is what I do. A better fix would be to have a way to just delete e-mail you don't want, meaning directly get rid or meaning just delete and by pass the trash. Proton could do this by add a future in the filters, to where people can move to delete instead of spam.

that would be nice, great idea,

i have protonmail a view days now and want to block a emailadres he is bothering me with stopid mails. Can i block this? and how, i put it now in the spambox...

You need to add this feature immediately.

@boris how do I enable that script? sorry I'm not too technical :) But I need to block certian addresses....they're so annoying lol

I had a hard time E-mail some people, that I really need to, It makes me wonder if some E-mail Clients, have this feature, included already!

I definitely agree a block sender button is desperately needed. I am having issues with some a-hole bothering me.

This little sieve script will do the job.
All emails in the blacklist will be ignored.

#discard email if the sender is in the black list
require ["extlists"];
if header :list "from" ":incomingdefaults:spam"{discard;}

Please add option to block an email address, to stop unwanted emails getting through. fed up of spam, Protonmail needs to do more and I am a user but its wearing thin.