<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t <\/div>\n <\/div>\n <\/div>\n <\/section>\n \t\t<\/div>\n\t\t<\/div>\n
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Configuring Postfix Authorized Networks<\/h2>\n
To ensure the newly installed Postfix mail server operates correctly, you’ll need to tweak its main configuration file. This involves specifying which clients are allowed to relay emails through Postfix.<\/p>\n
Step 1.<\/strong> Edit the main.cf file<\/strong>: This file is located in the \/etc\/postfix<\/strong> directory.<\/p>\n\n- If you want Postfix to forward emails only from the local machine, find and uncomment the following line by removing the #<\/strong> at the beginning:<\/li>\n<\/ul>\n
\r\nmynetworks_style = host\r\n<\/code><\/pre>\n\n- To manually set the list of trusted clients, use the mynetworks<\/strong> parameter (note that this will override the previous setting):<\/li>\n<\/ul>\n
\r\nmynetworks = {server1 IP address}, {server2 IP address}\r\n<\/code><\/pre>\nStep 2. <\/strong>After making changes to the configuration files, you must reload Postfix to apply them:<\/p>\n\r\n\/etc\/init.d\/postfix restart\r\n<\/code><\/pre>\nStep 3. <\/strong>You can now send messages from the specified clients (the local machine or the listed servers).<\/p>\nAdditionally, you’ll need to update your application’s configuration to ensure it works seamlessly with the new mail server setup. Add the appropriate code to your application’s configuration file on the VPS container.<\/p>\n
\r\npackage com.mkyong.common;\r\nimport java.util.Properties;\r\nimport javax.mail.Message;\r\nimport javax.mail.MessagingException;\r\nimport javax.mail.PasswordAuthentication;\r\nimport javax.mail.Session;\r\nimport javax.mail.Transport;\r\nimport javax.mail.internet.InternetAddress;\r\nimport javax.mail.internet.MimeMessage;\r\npublic class SendMailTLS {\r\npublic static void main(String[] args) {\r\nProperties props = new Properties();\r\nprops.put(\"mail.smtp.auth\", \"false\");\r\nprops.put(\"mail.smtp.starttls.enable\", \"false\");\r\nprops.put(\"mail.smtp.host\", \"host\");\r\nprops.put(\"mail.smtp.port\", \"25\");\r\ntry {\r\nSession session = Session.getInstance(props);\r\nMessage message = new MimeMessage(session);\r\nmessage.setFrom(new InternetAddress(\"from-email@jelastic.com\"));\r\nmessage.setRecipients(Message.RecipientType.TO,\r\nInternetAddress.parse(\"to-email@jelastic.com\"));\r\nmessage.setSubject(\"Testing Subject\");\r\nmessage.setText(\"Text of the message\");\r\nTransport.send(message);\r\nSystem.out.println(\"Done\");\r\n} catch (MessagingException e) {\r\nthrow new RuntimeException(e);\r\n}\r\n}\r\n}\r\n<\/code><\/pre>\nThat’s it! Your mail server is now configured to work with your application deployed on the VPS container.<\/p>\n
![\"Install](\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Setting-mail-for-CentOS01.png\" "\\"Install")
<\/a><\/p>\n![\"Download](\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Setting-mail-for-CentOS02.png\" "\\"Download")
<\/a><\/p>\n![\"Verify](\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Setting-mail-for-CentOS03.png\" "\\"Verify")
<\/a><\/p>\n