How to block email stalkers

2 mins
Receive and read emails

Harassing someone on the internet is called cyberstalking and is a criminal offense in many jurisdictions.

Unfortunately, it can be hard to enforce these laws because the internet spans so many jurisdictions, and because online stalkers often hide their real identities. This means the best solution is often simply to block the stalker.

Proton Mail allows users to deal with email stalkers by setting up an advanced sieve filter(new window). Please note that you can use simple filter rules(new window) to send an email stalker’s posts to your spam folder, but the following instructions allow you to completely block the digital stalker.

How to block someone on Proton Mail on the web:

  1. Sign in to your Proton Account at window)
  2. Open the email from the sender you’d like to block.
  3. Select the sender’s name and address in the From: field and click Block messages from this sender in the dropdown menu.
  1. Select Block to confirm. All incoming emails from this sender are now automatically blocked. 
  1. You can also learn how to manage your block list here

Stop stalker email with Proton Mail advanced sieve filters

1. Log in to Proton Mail at window).

2. Go to Settings → Go to settings → Proton Mail → Filters → Custom filters → Add sieve filter.

Add sieve filter button

3. Enter a descriptive name for the sieve filter, then click Next.

Box to enter name of your new sieve filter

4. Delete all text in the text field and paste in the following code:

require ["fileinto", "imap4flags"];

if anyof (address :all :comparator "i;unicode-casemap" :is "From" ["", "", ""]) {

Replace, etc., below with the email addresses you want to block. You can add as many email addresses as you like, inside quotation marks (“ ”) and separated by a comma. 

Window to edit your sieve filter

Click Save, and your new sieve filter to block email stalkers will be created. 

Emails sent from the email address(es) specified by the filter will simply be dropped. Neither you nor the sender will receive any notifications about the dropped emails.

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