Linux DHCP server configuration. The YoLinux portal covers topics from desktop to servers and from developers to users.How to set up a mail server in Ubuntu or Debian. This tutorial will discuss how to set up a working mail server in Ubuntu or Debian. As we know, the two major protocols used in a mail server are SMTP and POP/IMAP. In this tutorial, postfix will be used for SMTP, while dovecot will be used for POP/IMAP. Both are open source, stable and highly customizable. Edit Article wiki How to Configure Sendmail. Six Methods: Download Sendmail Set up Sendmail Configure Sendmail Build the Sendmail User Table Add your domain names to. Free Cisco MIB Database - Download, Search, and Upload MIBs Download Cisco SNMP MIBs for Free. This particular page contains a full list of all SNMP MIBS from Cisco. ![]()
Please note that securing a mail server is beyond the scope of this tutorial, and will be covered in future tutorials. Prerequisites. Each domain should have a DNS server. It is recommended NOT to use a live domain for testing purposes. In this tutorial, a test domain example. A DNS server for this hypothetical domain should have the following records at the least. Forward zone for example. IN MX 1. 0 mail. example. IN A 1. 92. 1. 68. Reverse zone for example. IN PTR mail. example. These users and mailboxes will be used as email accounts and their respective mailboxes. Creating a user is very easy. Setting up postfix can be done using apt- get. This will cause all mails originating from this mail server to have @example. The configuration files of postfix are stored in /etc/postfix. The following configuration files are important. Some of them may not be present and need to be created manually. Primarily used to define how a mail should be routed towards specific destination domains. Bypassing DNS queries can be a good example. In that case, one may need to send emails destined to domain XYZ. IP address X. Y. Y. X regardless of any DNS query results. The transport and aliases files are not provided with the installation, and created manually. The following lines are added/modified in the configuration file. For more detailed info about the parameters, refer to the official README and configuration document. In this case, all outgoing mail should have '@example. Not used in this tutorial and will be covered in the future##. Whether or not the mail server is listening on TCP port 2. It is very easy to set up and configure dovecot. Once again, apt- get will be used to install dovecot. Certificates can be manually created or imported later based on requirements. In this tutorial, a self- signed certificate generated by dovecot will be used. POP/IMAP: Preparing Configuration Files. The following parameters are modified as needed. Whether dovecot is running can also be verified using netstat. Email accounts can be configured using your favorite email client software in desktop, laptop, tablet or phone. The following is a screenshot with necessary parameters in Mozilla Thunderbird. Troubleshooting Mail Server. The log file /var/log/mail. Any clue about why email is not working can be found here. A test DNS server with all necessary records can be deployed, and mails can be exchanged between users in the same server, i. To make things more interesting, multiple mail servers with different domains can be deployed to check how email communication works across domains, given that necessary DNS records are present. Valid DNS records are needed for live mail servers. The settings of postfix and dovecot can be tuned based on needs. Warning: For those who want to deploy live mail servers, or any mail server that has access to the Internet, make sure that your SMTP is secured. Attacks on SMTP can commonly originate from the Internet, as well as from malicious software within the LAN.
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