EntityQ389601· pop 5· linked from 8 articlespostmasterSign in to saveadministrator of an email serverConnectionsInternet forumEntitymessage transfer agentEntityemailEntityInternational Standard Book NumberEntitydigital object identifierEntitySimple Mail Transfer ProtocolEntitydenial-of-service attackEntityInternet Engineering Task ForceEntitywebmasterEntityRequest for CommentsEntitysuperuserEntityemail addressEntitysysopEntityemail spamEntityOpen mail relayEntitybounce messageEntityJohn KlensinEntityCategoriesEmail