Since the cluster setup some e-mails are delived times * PMG members in cluster.
MX Records show same prio or one has higher (therefore lower) prio and servs as backup.
@ IN MX 10 pmg1.domain.de
@ IN MX 10 pmg2.domain.de
@ IN MX 30 pmg3.domain.de
or
@ IN MX 10 pmg1.domain.de
@ IN MX 10...
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