[S-mailx] s-mailx doesn't quit when it can't write

[russellbell]

        I had a disk failure when I tried to run s-nail (my fault) but
it gave infinite errors instead of quitting after the first try:

        EXT4-fs error (device sda4): ext4_journal_check_start:61: Detected 
aborted journal
        EXT4-fs (sda4): Remounting filesystem read-only

        s-nail: $TMPDIR is not a directory or not accessible: /tmp
        s-nail: $TMPDIR is not a directory or not accessible: /tmp

russell bell