{"id":7,"date":"2012-06-17T05:30:00","date_gmt":"2012-06-17T05:30:00","guid":{"rendered":"http:\/\/pheonixsolutions.com\/?p=7"},"modified":"2026-07-29T19:50:16","modified_gmt":"2026-07-29T14:20:16","slug":"mailscanner-allow-extensions","status":"publish","type":"post","link":"https:\/\/pheonixsolutions.com\/blog\/mailscanner-allow-extensions\/","title":{"rendered":"Mailscanner : Allow extensions like .docx, .dox"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Introduction<\/h2>\n\n\n\n<p>MailScanner is one of the most widely used email security gateways for Linux mail servers. It scans incoming and outgoing emails for viruses, spam, phishing attempts, and potentially dangerous attachments.<\/p>\n\n\n\n<p>By default, MailScanner may block certain file extensions based on its security policies. In some environments, organizations need to allow additional document formats such as <code>.docx<\/code> or custom extensions like <code>.dox<\/code> for business communication.<\/p>\n\n\n\n<p>This guide explains how to configure MailScanner to allow these file extensions safely.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Why MailScanner Blocks Attachments<\/h1>\n\n\n\n<p>MailScanner uses filename rules to determine whether an attachment should be:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Allowed<\/li>\n\n\n\n<li>Denied<\/li>\n\n\n\n<li>Renamed<\/li>\n\n\n\n<li>Quarantined<\/li>\n<\/ul>\n\n\n\n<p>Blocking potentially dangerous file types helps prevent:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Malware infections<\/li>\n\n\n\n<li>Ransomware<\/li>\n\n\n\n<li>Macro viruses<\/li>\n\n\n\n<li>Executable attachments disguised as documents<\/li>\n<\/ul>\n\n\n\n<p>Sometimes legitimate document types must be permitted for internal users.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Step 1: Locate the File Type Rules<\/h1>\n\n\n\n<p>MailScanner stores filename rules under:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/etc\/MailScanner\/<\/pre>\n\n\n\n<p>Depending on your distribution, the file may be:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">filename.rules.conf<\/pre>\n\n\n\n<p>or<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">filename.rules<\/pre>\n\n\n\n<p>Find the active configuration:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">grep -i \"Filename Rules\" \/etc\/MailScanner\/MailScanner.conf<\/pre>\n\n\n\n<p>Example output:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">Filename Rules = %etc-dir%\/filename.rules.conf<\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">Step 2: Open the Rules File<\/h1>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">sudo vi \/etc\/MailScanner\/filename.rules.conf<\/pre>\n\n\n\n<p>or<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">sudo nano \/etc\/MailScanner\/filename.rules.conf<\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">Step 3: Check Existing Rules<\/h1>\n\n\n\n<p>You may see entries like:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">deny     \\.exe$\ndeny     \\.bat$\ndeny     \\.scr$\nallow    \\.pdf$\nallow    \\.doc$\nallow    \\.xls$<\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">Step 4: Allow DOCX Files<\/h1>\n\n\n\n<p>If <code>.docx<\/code> is blocked or missing, add:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">allow    \\.docx$<\/pre>\n\n\n\n<p>Example:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">allow    \\.doc$\nallow    \\.docx$\nallow    \\.xlsx$\nallow    \\.pptx$<\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">Step 5: Allow Custom DOX Files<\/h1>\n\n\n\n<p>If your organization uses a custom extension such as <code>.dox<\/code>, add:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">allow    \\.dox$<\/pre>\n\n\n\n<p>Example:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">allow    \\.doc$\nallow    \\.docx$\nallow    \\.dox$<\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">Example Configuration<\/h1>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Microsoft Office\n\nallow    \\.doc$\nallow    \\.docx$\nallow    \\.xls$\nallow    \\.xlsx$\nallow    \\.ppt$\nallow    \\.pptx$\n\n# Custom Documents\n\nallow    \\.dox$\n\n# PDF\n\nallow    \\.pdf$<\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">Step 6: Save the File<\/h1>\n\n\n\n<p>After making the changes:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">:wq<\/pre>\n\n\n\n<p>or simply save if using Nano.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Step 7: Restart MailScanner<\/h1>\n\n\n\n<p>Reload the service:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">sudo systemctl restart MailScanner<\/pre>\n\n\n\n<p>Verify the service status:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">sudo systemctl status MailScanner<\/pre>\n\n\n\n<p>Expected output:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">Active: active (running)<\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">Step 8: Test the Configuration<\/h1>\n\n\n\n<p>Send a test email with:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>test.docx<\/li>\n\n\n\n<li>sample.dox<\/li>\n<\/ul>\n\n\n\n<p>Verify that:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Email is delivered<\/li>\n\n\n\n<li>Attachment is not renamed<\/li>\n\n\n\n<li>Attachment is not quarantined<\/li>\n\n\n\n<li>No MailScanner warnings appear<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">Check MailScanner Logs<\/h1>\n\n\n\n<p>Monitor logs while testing:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">tail -f \/var\/log\/maillog<\/pre>\n\n\n\n<p>or<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">tail -f \/var\/log\/mail.log<\/pre>\n\n\n\n<p>You should see entries indicating the message was processed successfully.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">If Attachments Are Still Blocked<\/h1>\n\n\n\n<p>Check whether another MailScanner rule is overriding your configuration.<\/p>\n\n\n\n<p>Search for <code>.docx<\/code>:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">grep -R \"docx\" \/etc\/MailScanner\/<\/pre>\n\n\n\n<p>Search for <code>.dox<\/code>:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">grep -R \"dox\" \/etc\/MailScanner\/<\/pre>\n\n\n\n<p>Also review:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">Filetype Rules\nDangerous Content Scanning\nArchive Rules\nIncoming Work Directory<\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">Verify MailScanner Configuration<\/h1>\n\n\n\n<p>Run:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">MailScanner --lint<\/pre>\n\n\n\n<p>A successful configuration returns:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">Infected message scanner: OK\n\nSpamAssassin: OK\n\nMailScanner.conf: OK<\/pre>\n\n\n\n<p>Resolve any reported errors before restarting the service.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Conclusion<\/h1>\n\n\n\n<p>MailScanner provides flexible attachment filtering that helps protect email infrastructure while allowing legitimate business documents. By updating the filename rules to include <code>.docx<\/code> and custom extensions like <code>.dox<\/code>, administrators can support organizational workflows without compromising overall email security.<\/p>\n\n\n\n<p>Always validate configuration changes using <code>MailScanner --lint<\/code>, monitor your mail logs, and allow only trusted file types to maintain a secure and reliable email environment.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction MailScanner is one of the most widely used email security gateways for Linux mail servers. It scans incoming and outgoing emails for viruses, spam, phishing attempts, and potentially dangerous attachments. By default, MailScanner may block certain file extensions based on its security policies. In some environments, organizations need to&hellip; <a href=\"https:\/\/pheonixsolutions.com\/blog\/mailscanner-allow-extensions\/\" class=\"more-link read-more\" rel=\"bookmark\">Continue Reading <span class=\"screen-reader-text\">Mailscanner : Allow extensions like .docx, .dox<\/span><i class=\"fa fa-arrow-right\"><\/i><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[14,227],"tags":[263,228],"class_list":{"0":"post-7","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-cpanel","7":"category-mailscanner","8":"tag-cpanel","9":"tag-mailscanner-2","10":"h-entry","12":"h-as-article"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Mailscanner : Allow extensions<\/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:\/\/pheonixsolutions.com\/blog\/mailscanner-allow-extensions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mailscanner : Allow extensions\" \/>\n<meta property=\"og:description\" content=\"Introduction MailScanner is one of the most widely used email security gateways for Linux mail servers. 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