Add versionchanged for #14984, remove extra blank from string.
Merge: Add versionchanged for #14984, remove extra blank from string.
#19037: adjust file times *before* moving maildir files into place.

This avoids race conditions when other programs are monitoring
the maildir directory.  Patch by janzert.
#14984: only import pwd on POSIX.
Merge #14984: only import pwd on POSIX.