Hi all. We've just migrated our back-end NFS mailstore from FC1 systems to CentOS4 and are experiencing problems/delays with vpopmail and user Maildirs. IMAP is fine, it's just POP access that causes us problems. Now, NFS mounts successfully, the clients can see /home/vpopmail and serve content as we would expect. IMAP works perfectly and sees new messages as soon as they're delivered into the Maildir, but POP doesn't seem to see new messages until about 90 minutes after it arrived. Messages can be seen in users' Maildir/new on the filesystem. The timestamps on new messages on the NFS filesystems don't appear to be formatted correctly, I'm guessing this could cause the POP weirdness? On an NFS client... [root at mailserv2 new]# ls -ltr total 4 -rw------- 1 vpopmail vchkpw 854 Feb 28 2006 1141126119.27119.mailserv1,S=773 Whereas on the NFS mailstore... [root at tempmailstore1a new]# ls -ltr total 4 -rw------- 1 vpopmail vchkpw 854 Feb 28 12:44 1141126119.27119.mailserv1,S=773 'touch'ing the files, either from the client or server doesn't appear to fix the timestamps. The old FC mailstores were running... kernel 2.4.22-1.2188.nptl nfs-utils-1.0.6-1 DRBD 0.6.12 heartbeat-1.0.4-2.fr.c.1.um.2 The new CentOS mailstores and all their clients are running... kernel 2.6.9-22.0.1.ELsmp nfs-utils-1.0.6-65.EL4 DRBD 0.7.14 heartbeat-1.2.3.cvs.20050927-1.centos4 Qmailrocks 2.2.0 /etc/exports on the mailstores contains... /mnt/drbd/ mailserv1(rw,sync,no_root_squash) /mnt/drbd/ mailserv2(rw,sync,no_root_squash) /mnt/drbd/ mailserv3(rw,sync,no_root_squash) /mnt/drbd/ mailserv4(rw,sync,no_root_squash) And the NFS mounts on the client mailservers look like... mailstore1:/mnt/drbd/home /home nfs defaults 0 0 If anyone's seen this or can shed any light it'd be much appreciated. Will.