Filters provide the ability to automatically have your encrypted ProtonMail inbox organized when sending and receiving new mail by creating a set of rules in your account Settings. Filters can be accessed by going to Settings –> Filters
For ProtonMail paid plan users, there is no limit to the number of Custom Filters that can be created. Free users are limited to one custom filter.
Adding new Filters
The Name of a filter is what you will see in the filters list. It is used for organizational purposes only, and does not have any effect on the filter you are creating.
Filters are comprised of 2 components Conditions and Actions.
Provide the instructions of what the filter will look for in the new messages or sent messages. This includes: email addresses (including the sender and the recipient address), words in the subject line, and whether a message has attachments or not.
Conditions can range in complexity based off your needs. The most simple condition is to select one of the options and enter one input. For instance: select Sender, Contains, and the enter the term “SALE.”
The OR and AND attributes allow you to add more complex conditions to fit your specific need.
OR attributes allow you to apply an action if any of the inputs you have provided are present in a new message or sent message.
For example: If you would like to perform an action on any new messages that contain either of the inputs “SALE” or “SPECIAL,” you would select the + button to add the input “SPECIAL.” You can add as many inputs as you need.
AND attributes allow you to apply an action if all of the inputs you have provided are present in a new message or sent message.
For example: If you would like to perform an action on any new messages that contain either of the inputs “SALE” or “SPECIAL,” you would select the ADD CONDITION link to add the input “SPECIAL.” You can add as many inputs as you need.
Actions cause the message to either get a label(s) applied, be moved to different folder, or marked as read or stared.
You can apply as many actions to the same filter as needed. You can choose to apply multiple labels, move a message to a new folder and mark a message as starred all at once. However, messages can only live in one folder at a time so you can only select one folder to move a message to.
You can edit any existing filter by selecting the Edit button next to the delete button in the filter list. This will allow you to see the existing conditions and actions on that filter, as well as make any edits you need to make.
You can turn filters on and off at any time. When a filter is ON the filter will be implemented on every new message that arrives in your inbox. If your filter is OFF that filter will not be implemented on any new incoming messages. Once the filter is turned ON, the filter will only be applied to new incoming messages.
When a new message is received and sent all filters that are on will be applied to the message. We start at the top of your filter list and execute each filter down the rows. If two filters apply to the same message, both will be applied unless the actions provide conflicting actions such as “Move to trash.” in one filter, and “Move to spam.” in another filter. In this case, the first filter that executes on the message will apply. If the filter that provides the action “Move to trash.” is further down the list of filters than the one that provides the action “Move to spam.” your message will be moved to the trash folder.
To change the order of your filters, you can click and drag the filter up or down to a different position in the list.
Manually delete individual filters by selecting the DELETE button found next to each filter in our Custom Filters list.
CLEAR ALL found next to the ADD NEW FILTER button within the Filters tab provides the ability to quickly delete all existing filters. Please note, these filters will be permanently deleted without the ability to automatically restore them. You will have to manually recreate the filters you want after you have deleted them.
Receiving spam in your inbox is one of the worst aspects of email. In addition to our smart spam filter, we have built manual controls that allow you to whitelist and blacklist certain email addresses for improved customization of the spam filter. You can learn more about how the whitelist and blacklist feature works here.
The filters section allows for even more customized spam filtering by allowing you to send emails directly to spam that meet a variety of different parameters, as seen above. One particular useful filter is the ability to send all mail from an entire domain to the spam folder. You can accomplish this by setting the Condition to Sender -> Containing -> exampledomain.com, and setting the Action to Move to -> Spam.
For Advance Filters, please see: Sieve Filtering.