Elm under 6.1 will not run where the filesystem that contains the mail file is an NFS filesystem. Error message is "Cannot flock folder "/var/spool/mail/phillips"! {No locks available]". Problem does NOT exist under 6.2. Downloading newer version of elm 2.5.3 does NOT fix problem. What else must be upgraded to fix problem (other than upgrading all Linux systems to 6.2, which we do not want to do at this time).
Since Red Hat 5.2, all MUA like elm do fcntl locking and mounting /var/spool/mail through NFS is *not* supported. Recompile from the src.rpm and enable dot locking if you wish to use NFS mounted /var/spool/mail