{"id":5849,"date":"2020-10-09T08:39:30","date_gmt":"2020-10-09T08:39:30","guid":{"rendered":"https:\/\/www.qloud.my\/?p=3261"},"modified":"2026-07-21T09:03:33","modified_gmt":"2026-07-21T09:03:33","slug":"linux-vps-use-case-setting-mail-server-inside-centos-vps","status":"publish","type":"post","link":"https:\/\/www.brandswift.my\/qloudmsp\/linux-vps-use-case-setting-mail-server-inside-centos-vps\/","title":{"rendered":"Linux VPS Use Case &#8211; Setting Mail Server Inside CentOS VPS"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Setting Mail Server Inside CentOS VPS<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">With Jelastic Platform it is possible to integrate mail server to your virtual private machine. Below, we\u2019ll guide you through the steps required to get one on within the CentOS VPS. For that, you need to access the required container over SSH protocol using the preferable connection flow (e.g. web-based client for CentOS in our case) and carry out the following steps:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"\/qloudmsp\/#setup\">Install and Test Mail Server<\/a><\/li>\n\n\n\n<li><a href=\"\/qloudmsp\/#configure\">Configure Authorized Networks<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Set Up and Test Mail Server<\/h2>\n\n\n\n<p class=\"has-text-align-left wp-block-paragraph\">In the current guide we are going to leverage the&nbsp;<a href=\"http:\/\/www.postfix.org\/\" target=\"_blank\" rel=\"noopener noreferrer\">Postfix&nbsp;<\/a>mail server, so follow the next steps to install it within your VPS container and verify if it works as intended.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1. Run the Postfix installer with the following <i>yum <\/i>command:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/docs.jelastic.com\/images\/middleware-stacks\/elastic-vps\/linux-vps-use-cases\/adding-mail-server-vps\/01.png\" alt=\"install postfix on vps\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">2. During the installation process, you\u2019ll need to confirm (i.e. press and submit the \u2018<b><i>y<\/i><\/b>&#8216; response) the following points:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>total download size<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/docs.jelastic.com\/images\/middleware-stacks\/elastic-vps\/linux-vps-use-cases\/adding-mail-server-vps\/02.png\" alt=\"postfix total download size\"\/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>importing GPG key<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/docs.jelastic.com\/images\/middleware-stacks\/elastic-vps\/linux-vps-use-cases\/adding-mail-server-vps\/03.png\" alt=\"postfix importing GPG key\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">When the installation is finished, you can test mail server operability with the following command:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted has-palette-color-5-background-color has-background\">echo thisistestmail | mail -s test {your_email}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Here, the <b><i>{your_email}<\/i><\/b> placeholder is an email address, the test email will be sent to.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">4. Now, check the specified email inbox to ensure a letter was sent.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><img decoding=\"async\" src=\"https:\/\/docs.jelastic.com\/images\/middleware-stacks\/elastic-vps\/linux-vps-use-cases\/adding-mail-server-vps\/40605bf68d3ae4e2a95f3c3a28e594355.png\" alt=\"postfix test email\">Great! Email server is installed and we can proceed to applying the appropriate configurations.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Configure Postfix Authorized Networks<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For the proper workflow of the recently installed Postfix mail server, you may need to apply some settings within its main configuration file. For example, you can manually specify the list of \u201ctrusted\u201d clients, that will be able to relay emails through the Postfix:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1. Edit the <em><strong>main.cf<\/strong><\/em> file, located in the <em><strong>etc\/postfix<\/strong> <\/em>directory with the following content:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>when Postfix should forward emails only from the local machine, uncomment (remove # at the start of the string) the following line:<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-preformatted has-palette-color-5-background-color has-background\">mynetworks_style = host<\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>alternatively, you can adjust the list of \u201ctrusted\u201d clients manually using the next parameter (in this case the previous setting will be ignored):<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-preformatted has-palette-color-5-background-color has-background\">mynetworks = {server1 IP address}, {server2 IP address}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">2. After editing configuration files, you need to reload Postfix in order to apply changes you\u2019ve made.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted has-palette-color-5-background-color has-background\">\/etc\/init.d\/postfix restart<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">3. Now you can send messages from the previously specified client (the local machine or the stated server(s)).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, you also need to adjust your application to work properly with the newly installed mail server. For that, add the code of the following type to your application configuration file deployed to VPS container.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted has-palette-color-5-background-color has-background\">package com.mkyong.common;  \nimport java.util.Properties;  \nimport javax.mail.Message;  \nimport javax.mail.MessagingException;  \nimport javax.mail.PasswordAuthentication;  \nimport javax.mail.Session;  \nimport javax.mail.Transport;  \nimport javax.mail.internet.InternetAddress;  \nimport javax.mail.internet.MimeMessage;  \npublic class SendMailTLS {  \n   public static void main(String[] args) {  \n       Properties props = new Properties();  \n       props.put(\"mail.smtp.auth\", \"false\");  \n       props.put(\"mail.smtp.starttls.enable\", \"false\");  \n       props.put(\"mail.smtp.host\", \"host\");  \n       props.put(\"mail.smtp.port\", \"25\");  \n           try {  \n           Session session = Session.getInstance(props);  \n           Message message = new MimeMessage(session);  \n           message.setFrom(new InternetAddress(\"from-email@qloud.my\"));  \n           message.setRecipients(Message.RecipientType.TO,  \n               InternetAddress.parse(\"to-email@qloud.my\"));  \n           message.setSubject(\"Testing Subject\");  \n           message.setText(\"Text of the message\");  \n           Transport.send(message);  \n           System.out.println(\"Done\");  \n       } catch (MessagingException e) {  \n           throw new RuntimeException(e);  \n       }  \n   }  \n}\n<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">That\u2019s all. The mail server has been successfully adjusted to work with application deployed to VPS container.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><b>Note:<\/b> You may refer to the Postfix <a href=\"http:\/\/www.postfix.org\/documentation.html\">official documentation<\/a> to reveal more details considering required mail server configurations.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Setting Mail Server Inside CentOS VPS With Jelastic Platform it is possible to integrate mail server to your virtual private machine. Below, we\u2019ll guide you through the steps required to get one on within the CentOS VPS. For that, you need to access the required container over SSH protocol using the preferable connection flow (e.g. [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[32],"tags":[],"class_list":["post-5849","post","type-post","status-publish","format-standard","hentry","category-cirrusgrid_documentation"],"blocksy_meta":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Linux VPS Use Case - Setting Mail Server Inside CentOS VPS - Qloud MSP<\/title>\n<meta name=\"description\" content=\"With Jelastic Platform it is possible to integrate mail server to your virtual private machine. 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