Howto add a Filter on Mailed-by header

[abgalphabet]

Hi,

I want to create a filter on the incoming mail on the "mailed-by"
header field. Do anybody have an idea how to create it?

Many thanks
Arthur

[North Country Maturing Gardener]

Isn't that already the "default"? Usually the "from" address is
already filled in for you when you go to "Filter messages like
this". The next thing you could do is put the "mailed-by" words in
the "from" field in "Filter messages like this".