CentOS Errata and Security Advisory 2008:0839
https://rhn.redhat.com/errata/RHSA-2008-0839.html
The following updated files have been uploaded and are currently syncing to the mirrors:
s390: updates/s390/RPMS/postfix-2.2.10-1.2.1.c4.s390.rpm updates/s390/RPMS/postfix-pflogsumm-2.2.10-1.2.1.c4.s390.rpm
s390x: updates/s390x/RPMS/postfix-2.2.10-1.2.1.c4.s390x.rpm updates/s390x/RPMS/postfix-pflogsumm-2.2.10-1.2.1.c4.s390x.rpm