Re: mhstore error, but only when procmail invokes

> *** Error in `mhstore': munmap_chunk(): invalid pointer: 0x00007ffee6682fb5 ***

Ooof.  Looks like we've got a double-free, or a free() on some non-allocated
chunk of memory.  I'd call that a bug, but without a stack trace or a
easily-reproducable test case that's gonna be tough to track down.

--Ken