On Tue, 12 Feb 2019, Rupert Gallagher wrote:

and we have now blocked their IP at the firewall,

A suggestion: it may hurt them more if you TCP tarpit them instead of just blocking them. That's what I do.

Perhaps a little stale, and overkill for manual punishment, but it documents the tools:

  http://www.impsec.org/~jhardin/antispam/spammer-firewall

--
 John Hardin KA7OHZ                    http://www.impsec.org/~jhardin/
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