who compiled mutt, and where?
The last couple of mutt versions have a postinst that call
suidregister with numeric values for user and group instead of
the names. This results in the nightly suidregister-check run
to complain that mutt_dotlock was 0.8 and now root.mail ...
I tried building mutt myself, and _that_ postinst has the names,
not the numbers.
Maybe you're using a buggy version of debhelper / whatever?
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