Created attachment 919216 [details]
Attached mbox file crashes formail, it's from a usenet archive of alt.arts.poetry.
$ formail -v
formail v3.22 2001/09/10
$ formail -s < mbox > /dev/null
*** Error in `formail': free(): invalid next size (fast): 0x00007f59d2e51080 ***
Segmentation fault (core dumped)
I guess it's this From header:
From: "Berryman's Legacy" <firstname.lastname@example.org"
*** This bug has been marked as a duplicate of bug 1137582 ***