{"id":28152,"date":"2015-03-26T13:00:00","date_gmt":"2015-03-26T13:00:00","guid":{"rendered":"http:\/\/blog.cpanel.com\/?p=28152"},"modified":"2015-03-26T13:00:00","modified_gmt":"2015-03-26T13:00:00","slug":"cpanel-vs-spam-greylisting-enters-the-fight","status":"publish","type":"post","link":"https:\/\/devel.www.cpanel.net\/blog\/products\/cpanel-vs-spam-greylisting-enters-the-fight\/","title":{"rendered":"cPanel vs Spam: Greylisting enters the fight!"},"content":{"rendered":"<p><a href=\"http:\/\/blog.cpanel.com\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-16-at-11.08.45-AM.png\"><img loading=\"lazy\" decoding=\"async\" class=\" size-medium wp-image-28162 alignleft\" src=\"http:\/\/blog.cpanel.com\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-16-at-11.08.45-AM-289x300.png\" alt=\"Screen Shot 2015-03-16 at 11.08.45 AM\" width=\"289\" height=\"300\" \/><\/a>cPanel is excited to announce that 11.50 will include a new feature that\u00a0 dramatically reduces the amount of spam you and your customers receive: Greylisting.<\/p>\n<p><!--more--><br \/>\nGreylisting is the process of deferring emails from unknown senders. When the email arrives, Greylisting causes the server to return a message that boils down to, \u201cI\u2019m busy at the moment, try again in a bit.\u201d Valid Mail Transfer Agents (MTAs), like Exim, will automatically retry many times. This retry time can be several minutes to start and last for several days. Invalid MTAs will simply give up and move to the next enticing spam target. We use these retry attempts as a way to weed out good email from bad.<\/p>\n<p>cPanel created its own Greylisting daemon, cpgrey, that runs at SMTP receipt time. This means it happens before any real data is sent. The cpgrey daemon looks for a triplet: a source IP address, a source email address, and a destination IP address. If this combination has not been seen in a set time frame (this time frame is configurable), cpgrey will defer all email from that triplet for a set initial block time (again this time frame is configurable.) After the initial block time has expired, the system will accept email from the triplet until the max block time has expired.<\/p>\n<p>Greylisting has its own interface in WHM that allows root users to configure many aspects of the system. You can set the time for the initial block, the must retry time, and the triplet expire time. You can also allow emails with valid SPF records to bypass Greylisting completely. The interface also includes a Trusted Hosts page that allows you to configure IP addresses and CIDR ranges to bypass Greylisting. Finally, we have added a simple report that allows you to see the current triplets in the Greylisting database. You can even add IP addresses and CIDR ranges directly from the report.<\/p>\n<p><a href=\"http:\/\/blog.cpanel.com\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-16-at-11.08.39-AM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"  wp-image-28172 aligncenter\" src=\"http:\/\/blog.cpanel.com\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-16-at-11.08.39-AM-300x106.png\" alt=\"Screen Shot 2015-03-16 at 11.08.39 AM\" width=\"419\" height=\"148\" \/><\/a><br \/>\ncPanel users are able to control which of their domains use Greylisting through the Greylisting interface in both PaperLantern and x3. cPanel users will see a list of domains they control and a simple toggle to disable or enable Greylisting. Bulk actions to enable all or disable all are included in a gear icon located in the top right corner.<br \/>\nWe highly recommend server administrators use Greylisting as a strong tool in their arsenal for combating spam.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>cPanel is excited to announce that 11.50 will include a new feature that\u00a0 dramatically reduces the amount of spam you and your customers receive: Greylisting.<\/p>\n","protected":false},"author":77,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[49],"tags":[],"class_list":["post-28152","post","type-post","status-publish","format-standard","hentry","category-products"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>cPanel vs Spam: Greylisting enters the fight! | cPanel<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/devel.www.cpanel.net\/blog\/products\/cpanel-vs-spam-greylisting-enters-the-fight\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"cPanel vs Spam: Greylisting enters the fight! | cPanel\" \/>\n<meta property=\"og:description\" content=\"cPanel is excited to announce that 11.50 will include a new feature that\u00a0 dramatically reduces the amount of spam you and your customers receive: Greylisting.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/devel.www.cpanel.net\/blog\/products\/cpanel-vs-spam-greylisting-enters-the-fight\/\" \/>\n<meta property=\"og:site_name\" content=\"cPanel\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/cpanel\/\" \/>\n<meta property=\"article:published_time\" content=\"2015-03-26T13:00:00+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/blog.cpanel.com\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-16-at-11.08.45-AM-289x300.png\" \/>\n<meta name=\"author\" content=\"cPanel Community\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@cPanel\" \/>\n<meta name=\"twitter:site\" content=\"@cPanel\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"cPanel Community\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/devel.www.cpanel.net\/blog\/products\/cpanel-vs-spam-greylisting-enters-the-fight\/\",\"url\":\"https:\/\/devel.www.cpanel.net\/blog\/products\/cpanel-vs-spam-greylisting-enters-the-fight\/\",\"name\":\"cPanel vs Spam: Greylisting enters the fight! | cPanel\",\"isPartOf\":{\"@id\":\"https:\/\/devel.www.cpanel.net\/#website\"},\"datePublished\":\"2015-03-26T13:00:00+00:00\",\"dateModified\":\"2015-03-26T13:00:00+00:00\",\"author\":{\"@id\":\"https:\/\/devel.www.cpanel.net\/#\/schema\/person\/8cf97408aad4fb70cf55d11a1d4f57f8\"},\"breadcrumb\":{\"@id\":\"https:\/\/devel.www.cpanel.net\/blog\/products\/cpanel-vs-spam-greylisting-enters-the-fight\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/devel.www.cpanel.net\/blog\/products\/cpanel-vs-spam-greylisting-enters-the-fight\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/devel.www.cpanel.net\/blog\/products\/cpanel-vs-spam-greylisting-enters-the-fight\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/devel.www.cpanel.net\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"cPanel vs Spam: Greylisting enters the fight!\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/devel.www.cpanel.net\/#website\",\"url\":\"https:\/\/devel.www.cpanel.net\/\",\"name\":\"cPanel\",\"description\":\"Hosting Platform of Choices\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/devel.www.cpanel.net\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/devel.www.cpanel.net\/#\/schema\/person\/8cf97408aad4fb70cf55d11a1d4f57f8\",\"name\":\"cPanel Community\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/devel.www.cpanel.net\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/e1949945083b5526bb95711bd3d616b3?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/e1949945083b5526bb95711bd3d616b3?s=96&d=mm&r=g\",\"caption\":\"cPanel Community\"},\"description\":\"The web hosting industry's most reliable management solution since 1997. With our first-class support and rich feature set, it's easy to see why our customers and partners make cPanel &amp; WHM their hosting platform of choice. For more information, visit cPanel.net.\",\"sameAs\":[\"https:\/\/cpanel.net\"],\"url\":\"https:\/\/devel.www.cpanel.net\/blog\/author\/cpadmin\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"cPanel vs Spam: Greylisting enters the fight! | cPanel","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/devel.www.cpanel.net\/blog\/products\/cpanel-vs-spam-greylisting-enters-the-fight\/","og_locale":"en_US","og_type":"article","og_title":"cPanel vs Spam: Greylisting enters the fight! | cPanel","og_description":"cPanel is excited to announce that 11.50 will include a new feature that\u00a0 dramatically reduces the amount of spam you and your customers receive: Greylisting.","og_url":"https:\/\/devel.www.cpanel.net\/blog\/products\/cpanel-vs-spam-greylisting-enters-the-fight\/","og_site_name":"cPanel","article_publisher":"https:\/\/www.facebook.com\/cpanel\/","article_published_time":"2015-03-26T13:00:00+00:00","og_image":[{"url":"http:\/\/blog.cpanel.com\/wp-content\/uploads\/2015\/03\/Screen-Shot-2015-03-16-at-11.08.45-AM-289x300.png"}],"author":"cPanel Community","twitter_card":"summary_large_image","twitter_creator":"@cPanel","twitter_site":"@cPanel","twitter_misc":{"Written by":"cPanel Community","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/devel.www.cpanel.net\/blog\/products\/cpanel-vs-spam-greylisting-enters-the-fight\/","url":"https:\/\/devel.www.cpanel.net\/blog\/products\/cpanel-vs-spam-greylisting-enters-the-fight\/","name":"cPanel vs Spam: Greylisting enters the fight! | cPanel","isPartOf":{"@id":"https:\/\/devel.www.cpanel.net\/#website"},"datePublished":"2015-03-26T13:00:00+00:00","dateModified":"2015-03-26T13:00:00+00:00","author":{"@id":"https:\/\/devel.www.cpanel.net\/#\/schema\/person\/8cf97408aad4fb70cf55d11a1d4f57f8"},"breadcrumb":{"@id":"https:\/\/devel.www.cpanel.net\/blog\/products\/cpanel-vs-spam-greylisting-enters-the-fight\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/devel.www.cpanel.net\/blog\/products\/cpanel-vs-spam-greylisting-enters-the-fight\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/devel.www.cpanel.net\/blog\/products\/cpanel-vs-spam-greylisting-enters-the-fight\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/devel.www.cpanel.net\/"},{"@type":"ListItem","position":2,"name":"cPanel vs Spam: Greylisting enters the fight!"}]},{"@type":"WebSite","@id":"https:\/\/devel.www.cpanel.net\/#website","url":"https:\/\/devel.www.cpanel.net\/","name":"cPanel","description":"Hosting Platform of Choices","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/devel.www.cpanel.net\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/devel.www.cpanel.net\/#\/schema\/person\/8cf97408aad4fb70cf55d11a1d4f57f8","name":"cPanel Community","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/devel.www.cpanel.net\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/e1949945083b5526bb95711bd3d616b3?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/e1949945083b5526bb95711bd3d616b3?s=96&d=mm&r=g","caption":"cPanel Community"},"description":"The web hosting industry's most reliable management solution since 1997. With our first-class support and rich feature set, it's easy to see why our customers and partners make cPanel &amp; WHM their hosting platform of choice. For more information, visit cPanel.net.","sameAs":["https:\/\/cpanel.net"],"url":"https:\/\/devel.www.cpanel.net\/blog\/author\/cpadmin\/"}]}},"_links":{"self":[{"href":"https:\/\/devel.www.cpanel.net\/wp-json\/wp\/v2\/posts\/28152"}],"collection":[{"href":"https:\/\/devel.www.cpanel.net\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devel.www.cpanel.net\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devel.www.cpanel.net\/wp-json\/wp\/v2\/users\/77"}],"replies":[{"embeddable":true,"href":"https:\/\/devel.www.cpanel.net\/wp-json\/wp\/v2\/comments?post=28152"}],"version-history":[{"count":0,"href":"https:\/\/devel.www.cpanel.net\/wp-json\/wp\/v2\/posts\/28152\/revisions"}],"wp:attachment":[{"href":"https:\/\/devel.www.cpanel.net\/wp-json\/wp\/v2\/media?parent=28152"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devel.www.cpanel.net\/wp-json\/wp\/v2\/categories?post=28152"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devel.www.cpanel.net\/wp-json\/wp\/v2\/tags?post=28152"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}