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diff --git a/doc/markdown/modules/spf.md b/doc/markdown/modules/spf.md deleted file mode 100644 index 281cd91b4..000000000 --- a/doc/markdown/modules/spf.md +++ /dev/null @@ -1,34 +0,0 @@ -# SPF module - -SPF module performs checks of the sender's [SPF](http://www.openspf.org/) policy. -Many mail providers uses SPF records to define which hosts are eligible to send email -for this specific domain. In fact, there are many possibilities to create and use -SPF records, however, all they check merely the sender's domain and the sender's IP. - -The specific case are automated messages from the special mailer daemon address: -`<>`. In this case rspamd uses `HELO` to grab domain information as specified in the -standart. - -## Principles of work - -`SPF` can be a powerfull tool when properly used. However, it is very fragile in many -cases: when a message is somehow redirected or reconstructed by mailing lists software. - -Moreover, many mail providers have no clear understanding of this technology and -misuse the SPF technique. Hence, the scores for SPF symbols are relatively small -in rspamd. - -SPF uses DNS service extensively, therefore rspamd maintain the cache of SPF records. -This caches operates on principle of `least recently used` expiration. All cached items -lifetimes is accordingly limited by the matching DNS record time to live. - -You can manually specify the size of this cache by configuring SPF module: - -~~~ucl -spf { - spf_cache_size = 1k; # cache up to 1000 of the most recent SPF records -} -~~~ - -Currently, rspamd supports the full set of SPF elements, macroes and has internal -protection from DNS recursion. |