K-9's non-standard handling of mailing lists

[ilmaisin]

thunderbird/thunderbird-android/issues/2588

K-9 Mail handles the mailing lists in a non-standard manner that is AFAIK completely unique among email clients. When you press the "reply" button that is supposed to send the reply to the sender only, it sends the reply to the "List-Post" address instead. This may result in non-public information getting inadvertently published. Maybe the users should be told about this caveat.

[dngray]

After reading through thunderbird/thunderbird-android#3738 it does in fact seem like this is an issue.

Opened PR privacyguides/privacyguides.org#2012