spmfilter是一个邮件过滤框架，其目标是成为一个通用的满足各种过滤要求的框架。TheAPIenablesspmfilterpluginstoaccessmessagesastheyarebeingprocessedbytheMTA.Thisallowsthemtoexamineandmodifymessagecontentandmeta-informationduringtheSMTPtransaction.Pluginsareloadedatruntimeandcanbeprocessedinanysequence.Theprocessingchaincanalsobealteredbyasingleplugin,forexampleifthepluginhastostopfurtherprocessing.
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