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DNS resolver settings are configured using the resolver
compound statement:
resolver { config filename; max-cname-chain num; }
Name of the resolver configuration file to use, instead of the default /etc/resolv.conf.
Maximum allowed length of a DNS CNAME chain that will be
followed. A CNAME chain is a sequence of CNAME
records
pointing to another CNAME
s. Although CNAME chains are not
considered a good practice, many sites still use them. By default the
mailfromd
resolver allows at most one CNAME record pointing
to a CNAME (this corresponds to max-cname-chain 2
). If you
need to follow longer chains, raise this value. Note however, that
using values greater than 5 is not a good idea, anyway.