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Filtering incoming messages is important to avoid unwelcome use-cases, like spamming from certain addresses. Regarding this, Email This Issue provides you with options to cover some frequent needs.

Filters are used during the mail fetching phase. This means, if a mail is filtered out by these filters, it will not be enqueued for processing.

From a higher level perspective, filters can be categorized as follows: There are filters, that work in a global scope (e.g. sender address filters) and there are filters, whose scope is restricted to a given Mail Handler. In this document, you can read about Mail Handler-related filters.

In order to fine-tune filtering behavior, two categories of filters come into action:

  1. Accept (or pass-through) filters to restrict or customize, which messages should specifically arrive to the Mail Handler’s processing phase (but not others).

  2. Reject filters to control, which messages should be filtered out for any case and not arrive the Mail Handler’s processing phase.

Filters can be configured on the Filters tab:

Accept filters

Accept email can be used to filter messages in a mailbox, if it has multiple email addresses (like mail aliases).

The following options are available:

Reject filters

These are classical filters. If any of the activated filter conditions proves true, the incoming message will be completely ignored from further processing: