{"id":25127,"date":"2025-11-11T19:43:34","date_gmt":"2025-11-11T19:43:34","guid":{"rendered":"https:\/\/iserversupport.com\/?p=25127"},"modified":"2025-11-11T19:43:34","modified_gmt":"2025-11-11T19:43:34","slug":"how-to-find-a-spammer-on-a-plesk-server-complete-step-by-step-guide","status":"publish","type":"post","link":"https:\/\/iserversupport.com\/blog\/how-to-find-a-spammer-on-a-plesk-server-complete-step-by-step-guide\/","title":{"rendered":"How to Find a Spammer on a Plesk Server: Complete Step-by-Step Guide"},"content":{"rendered":"<p class=\"p1\">If your Plesk server suddenly starts sending large volumes of unwanted emails or your IP gets blacklisted, there\u2019s a good chance that one of your mailboxes or websites has been compromised.<\/p>\n<p class=\"p1\">In this guide, you\u2019ll learn exactly how to find and stop a spammer on a Plesk server using both the control panel and the command line.<\/p>\n<hr \/>\n<h2><b>1. Identify the Symptoms of Spamming<\/b><\/h2>\n<p class=\"p1\">The first sign of a spammer is often unusual server behavior such as:<\/p>\n<ul>\n<li>\n<p class=\"p1\">A rapidly growing mail queue<\/p>\n<\/li>\n<li>\n<p class=\"p1\">High CPU or RAM usage from the mail service<\/p>\n<\/li>\n<li>\n<p class=\"p1\">Outbound mail rejections or delivery delays<\/p>\n<\/li>\n<li>\n<p class=\"p1\">Abuse complaints from recipients or RBL listings<\/p>\n<\/li>\n<\/ul>\n<p class=\"p1\">Before taking drastic action, confirm that the spam is really coming from your server.<\/p>\n<hr \/>\n<h2><b>2. Check the Mail Queue in Plesk<\/b><\/h2>\n<h3><b>Using the GUI<\/b><\/h3>\n<p class=\"p4\"><span class=\"s3\">Go to <\/span><b>Tools &amp; Settings \u2192 Mail Server Settings \u2192 Mail Queue<\/b><span class=\"s3\">.<\/span><\/p>\n<p class=\"p1\">Here you can see which users or domains are generating the most messages.<\/p>\n<p class=\"p1\">Sort by <span class=\"s1\"><b>Sender<\/b><\/span> or <span class=\"s1\"><b>Count<\/b><\/span> to spot suspicious accounts quickly.<\/p>\n<p class=\"p4\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-25129\" src=\"https:\/\/iserversupport.com\/wp-content\/uploads\/2025\/11\/plesk-mail-queue.png\" alt=\"Plesk mail queue screen showing large number of queued messages from a compromised account.\n\" width=\"1826\" height=\"1216\" srcset=\"https:\/\/iserversupport.com\/blog\/wp-content\/uploads\/2025\/11\/plesk-mail-queue-200x133.png 200w, https:\/\/iserversupport.com\/blog\/wp-content\/uploads\/2025\/11\/plesk-mail-queue-300x200.png 300w, https:\/\/iserversupport.com\/blog\/wp-content\/uploads\/2025\/11\/plesk-mail-queue-400x266.png 400w, https:\/\/iserversupport.com\/blog\/wp-content\/uploads\/2025\/11\/plesk-mail-queue-600x400.png 600w, https:\/\/iserversupport.com\/blog\/wp-content\/uploads\/2025\/11\/plesk-mail-queue-768x511.png 768w, https:\/\/iserversupport.com\/blog\/wp-content\/uploads\/2025\/11\/plesk-mail-queue-800x533.png 800w, https:\/\/iserversupport.com\/blog\/wp-content\/uploads\/2025\/11\/plesk-mail-queue-1024x682.png 1024w, https:\/\/iserversupport.com\/blog\/wp-content\/uploads\/2025\/11\/plesk-mail-queue-1200x799.png 1200w, https:\/\/iserversupport.com\/blog\/wp-content\/uploads\/2025\/11\/plesk-mail-queue-1536x1023.png 1536w, https:\/\/iserversupport.com\/blog\/wp-content\/uploads\/2025\/11\/plesk-mail-queue.png 1826w\" sizes=\"(max-width: 1826px) 100vw, 1826px\" \/><\/p>\n<hr \/>\n<h3><b>Using the Command Line<\/b><\/h3>\n<p class=\"p1\">SSH into your server and check the queue directly:<\/p>\n<pre><code># For Postfix\r\npostqueue -p\r\n\r\n# For Qmail\r\nqmail-qstat\r\nqmail-qread<\/code><\/pre>\n<p class=\"p1\">Look for any single sender with hundreds of messages or unknown domains.<\/p>\n<hr \/>\n<h2><b>3. Trace the Spam Source in Mail Logs<\/b><\/h2>\n<p class=\"p1\">Plesk stores detailed mail logs in <span class=\"s2\">\/var\/log\/maillog<\/span>.<\/p>\n<p class=\"p1\">To find the top sending users, run:<\/p>\n<pre><code>grep \"status=sent\" \/var\/log\/maillog | awk '{print $7}' | sort | uniq -c | sort -nr | head<\/code><\/pre>\n<p class=\"p1\">If you see results like <span class=\"s1\">apache@hostname<\/span> or <span class=\"s1\">www-data<\/span>, the messages are being sent from a PHP script instead of a real mailbox.<\/p>\n<p class=\"p3\">\n<hr \/>\n<h2><b>4. Detect Spamming PHP Scripts<\/b><\/h2>\n<p class=\"p1\">Check which site or file is sending mail through PHP:<\/p>\n<pre><code>grep \"PHP script\" \/var\/log\/maillog | grep sendmail | tail -20<\/code><\/pre>\n<p class=\"p1\">A result like<\/p>\n<p class=\"p2\">\/var\/www\/vhosts\/example.com\/httpdocs\/wp-content\/themes\/tmpmail.php<\/p>\n<p class=\"p1\">means a web shell or hacked script is responsible. Delete or quarantine it immediately.<\/p>\n<hr \/>\n<h2><b>5. Find Compromised Mailboxes<\/b><\/h2>\n<p class=\"p1\">Sometimes a legitimate mailbox gets hijacked and used for SMTP spamming.<\/p>\n<p class=\"p1\">Run this command to check authentication logs:<\/p>\n<pre><code>grep \"auth\" \/var\/log\/maillog | grep \"sasl_username\"<\/code><\/pre>\n<p class=\"p1\">If one address appears excessively, reset that mailbox password and force TLS authentication only.<\/p>\n<hr \/>\n<h2><b>6. Limit Outgoing Mail in Plesk<\/b><\/h2>\n<p class=\"p4\"><span class=\"s2\">Go to <\/span><b>Mail \u2192 Mail Settings \u2192 Outgoing Mail Control<\/b><span class=\"s2\"> and set hourly message limits.<\/span><\/p>\n<p class=\"p1\">Recommended limits:<\/p>\n<ul>\n<li>\n<p class=\"p1\"><span class=\"s1\"><b>Per mailbox:<\/b><\/span> 200 messages\/hour<\/p>\n<\/li>\n<li>\n<p class=\"p1\"><span class=\"s1\"><b>Per domain:<\/b><\/span> 500 messages\/hour<\/p>\n<\/li>\n<\/ul>\n<p class=\"p1\">This prevents a single account from flooding the mail queue.<\/p>\n<hr \/>\n<h2><b>7. Scan for Malware and Infected Files<\/b><\/h2>\n<p class=\"p1\">Use a scanner like <span class=\"s3\"><b>ImunifyAV<\/b><\/span> or <span class=\"s3\"><b>ClamAV<\/b><\/span> to locate malicious scripts:<\/p>\n<pre><code>clamscan -r \/var\/www\/vhosts\/ --infected --remove<\/code><\/pre>\n<p class=\"p1\">Also check for recently modified PHP files:<\/p>\n<pre><code>find \/var\/www\/vhosts\/ -type f -mtime -1 -name \"*.php\"<\/code><\/pre>\n<p class=\"p1\">Delete or isolate any suspicious files found under user directories.<\/p>\n<hr \/>\n<h2><b>8. Check for Suspicious Cron Jobs<\/b><\/h2>\n<p class=\"p1\">Attackers often schedule scripts to restart spam campaigns automatically.<\/p>\n<p class=\"p1\">List cron jobs and search for strange commands:<\/p>\n<pre><code>crontab -l\r\ngrep -r \"curl\" \/etc\/cron*<\/code><\/pre>\n<p class=\"p1\">Remove any job that executes unknown PHP or curl commands.<\/p>\n<hr \/>\n<h2><b>9. Secure and Harden the Server<\/b><\/h2>\n<p class=\"p1\">Once you\u2019ve removed the spam source, lock down your system:<\/p>\n<ul>\n<li>\n<p class=\"p1\">Update Plesk and all installed CMSs like WordPress or Joomla.<\/p>\n<\/li>\n<li>\n<p class=\"p1\">Change every FTP, database, and email password.<\/p>\n<\/li>\n<li>\n<p class=\"p1\">Enable Fail2Ban jails for mail and Apache.<\/p>\n<\/li>\n<li>\n<p class=\"p1\">Apply SPF, DKIM, and DMARC DNS records.<\/p>\n<\/li>\n<li>\n<p class=\"p1\">Disable unused mail accounts or domains.<\/p>\n<\/li>\n<\/ul>\n<p class=\"p1\">This prevents reinfection and strengthens overall mail security.<\/p>\n<hr \/>\n<h2><b>10. Prevent Future Spam Incidents<\/b><\/h2>\n<ul>\n<li>\n<p class=\"p1\">Monitor mail queue and system load regularly.<\/p>\n<\/li>\n<li>\n<p class=\"p1\">Limit PHP mail() and encourage SMTP authentication.<\/p>\n<\/li>\n<li>\n<p class=\"p1\">Set up alert scripts for unusual outbound volume.<\/p>\n<\/li>\n<li>\n<p class=\"p1\">Keep PHP, web apps, and plugins up to date.<\/p>\n<\/li>\n<li>\n<p class=\"p1\">Run malware scans at least weekly.<\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h2><b>Conclusion<\/b><\/h2>\n<p class=\"p1\">Finding a spammer on a Plesk server takes patience and a methodical approach.<\/p>\n<p class=\"p1\">Check your mail logs, trace the sender, scan for infected scripts, and lock down compromised accounts.<\/p>\n<p class=\"p1\">Once you\u2019ve cleaned up, set proper limits and monitoring to prevent it from happening again.<\/p>\n<p class=\"p1\">If you need help tracking persistent spam or blacklist issues, <span class=\"s2\"><b>iServerSupport<\/b><\/span> can clean, secure, and restore your Plesk mail server fast.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>If your Plesk server suddenly starts sending large volumes of unwanted emails or your IP gets blacklisted, there\u2019s a good chance that one of your mailboxes or websites has been [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.6 - 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