Yum update failed due to the dependencie libmysqlclient.so.18 issue

Issue

• The yum update failed due to a dependency issue with libmysqlclient.so.18.

Error: Package: 2:postfix-2.10.1-9.el7.x86_64 (@rhel-7-server-rpms)
           Requires: libmysqlclient.so.18()(64bit)
           Available: 1:mariadb-libs-5.5.35-3.el7.x86_64 (rhel-7-server-rpms)
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Error: Package: 2:postfix-2.10.1-9.el7.x86_64 (@rhel-7-server-rpms)
           Requires: libmysqlclient.so.18(libmysqlclient_18)(64bit)
           Available: 1:mariadb-libs-5.5.35-3.el7.x86_64 (rhel-7-server-rpms)