When you select “all incoming email” on a webmail filter it will apply to all email regardless of conditions, so, for example;
You create a filter to test for the condition “from” = “brad@example.com”
You set it to apply to “all incoming email”
You set it to move to Trash.
This will then send ALL subsequent incoming email, regardless of condition, to Trash.
This is literally what a client selected as the first example of a filter being setup, because semantically it makes sense, you want your filter to apply to all incoming email, that’s how it makes sense in English. Why would this “all incoming email” clause even exist? Is it for setting up total mail2mail forwarding or something? I just can’t think of a pluralised scenario where this option would make sense and wouldn’t baffle clients who subsequently block all their incoming email lol.
Cheers!
Brad.