John Franks wrote:
Backing out of the krb5-libs packages permitted dovecot to work again.
Answering my own question I found the following CentOS web page which solved the problem. http://wiki.centos.org/Manuals/ReleaseNotes/CentOS5.1/ In the "Known Issues" Section I found:"The Dovecot package on x86_64 kernels requires the parameter "login_process_size = 64" to be added to /etc/dovecot.conf after an upgrade to CentOS 5.1."
which seems to have resolved the issue.
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