The name of a mail exchanger, the forwards of whose domains we should
ignore. For example, if one mail exchanger, mx1.example.com, has
strict spam filtering, it may be acceptable to have remote forwarding
for domains that have mx1.example.com as their sole mail exchanger (MX
record). In that case, you might want to exclude those domains from
the report by naming mx1.example.com here.
The name of a mail exchanger, the forwards of whose domains we should
ignore. For example, if one mail exchanger, mx1.example.com, has
strict spam filtering, it may be acceptable to have remote forwarding
for domains that have mx1.example.com as their sole mail exchanger (MX
record). In that case, you might want to exclude those domains from
the report by naming mx1.example.com here.