unsetting folder on commandline

[Tavis Ormandy]

Hello, I usually use mutt with folder=imap://..., which works fine.
Sometimes I need to examine a local mbox file, but `-f mboxfile` still
connects to imap which makes startup very slow.

Is there a way to prevent that?

I realise I can do something like set folder=`test -n $DONTCONNECT &&
echo imaps://..`, but is that really the best solution?

Thanks, Tavis.

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