If a host has an expired certificate mutt warns about that fact. It offers to permanently use it, or accept it just once. This UI works with 'env -u LANG mutt', but not with 'env LANG=de_DE.UTF-8 mutt'. The suggested keys do just nothing. 'killall mutt' is appearently the only way out. This happens since a few months already with mutt.hg#master, or whatever the branch name is.
Olaf
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