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8.8.8.8:5 is 8.8.8.8 port 5, which is clearly incorrect. It seems that
the documentation is broken here. For example,
https://rspamd.com/doc/configuration/upstream.html describes a sane DNS
setup where both port and priority are specified.
Furthermore, all public resolvers such as 8.8.8.8 are banned by SURBL so
that won't help to resolve your issue.