[Arm-netbook] mailing list settings

[Luke Kenneth Casson Leighton]

as an experiment i'm setting "content filtering", particularly the option
to convert text/html parts to plain text, but it also strips
multipart/alternativee
and a few other things.

the general idea is to make it easier to interact on complex multi-reply
topics by enforcing text-only.  replying to text-only should, by default
in most mailers, result in the familiar ">"s for every single line, as
per standard netiquette guidelines.

i will test this shortly.

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