mention how to proper download the data feed.

bigio · Aug 24, 2020 · 8f21fb9 · 8f21fb9
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diff --git a/README.MD b/README.MD
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 Mail::SpamAssassin::Plugin::Esp
 
 SpamAssassin plugin for Invaluement.com Service Provider DNSBLs ("SPBL").
+
+The plugin doesn't download the data feed, the txt file should be downloaded using
+"curl -z" or similar setting for "wget" that only downloads the file when the server versions are newer.