Upgrade by EZ templates on conflict:
Error: plesk-mail-pc-driver conflicts with psa-qmail
Error: plesk-mail-pc-driver conflicts with psa-qmail-rblsmtpd
Error: /usr/share/vzyum/bin/yum failed, exitcode=1
psa-mail-qc-driver package from older version of Plesk has no conflict with
psa-qmail-rblsmtpd packages and these packages can be installed simultaneously, on maildriver switching from psa-qmail to postfix by EZ templates for example. But newer versions of
plesk-mail-pc-driver have such conflict and cannot be installed until
psa-qmail-rblsmtpd are installed.
Upgrade by lates version of autonstaller .
psa-qmail-rblsmtpd packages before upgrade.