/var/spool/mail on NFS

I have the following scenario: I have a SuSE 7.2 machine that exports /var/spool/mail I have a mix of Irix servers that mount /var/spool/mail and write to the mail files. I have been getting corrupted mail files lately. This all happened when I moved the mail server to a Red Hat 7.2 system. Due to NFS problems I went back to SuSE. The main problem is that before when I was running SuSE 7.0 I did not get corrupt mail files, but now, since I reverted back to SuSE, I went with version 7.2 and noe I am getting occasional corrupt mail files. Does anyone know of any problems related to this?> Thanks, CC --- Chuck Carson Clinicomp International Sr. Systems Engineer San Diego, California O: +1 (858) 646-2095 F: +1 (858) 297-8570