Hi Jordi--
I just hit debian #543544 ("input in flex scanner failed") myself, and i
think i can show you how to reproduce it:
mkdir ~/.mail
According to strace, /usr/bin/mail is trying to read() from ~/.mail, but
when ~/.mail is a directory, it gets EISDIR, which triggers this error.
I suspect that you don't have a directory at ~/.mail, but both Jameson
and Andrew probably do in the circumstances that they're seeing this
behavior.
If /usr/bin/mailx is intended to read different config files than
/usr/bin/mail, that might explain why the proposed workaround is
effective too.
hth,
--dkg
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