Postfix null client

Furthermore, I would like to replace the user name in the sending address with noreply , without having to set up a new user account named noreply. I downloaded separate Let's Encrypt certificates for the Nginx web server example. Some tutorials recommend setting a MX record, others do not. As I said, I have played around with the configuration for days and reviewed the documentation as well as tutorials and numerous forum discussions.

Nothing produced the intended result. The task is simply to set up a secure mail server that sends emails from the command line, while not allowing for incoming emails.

Which of the above outlined settings are incorrect or not appropriate in this application? I am new to mail servers and am looking forward to receiving any helpful comments and answers - other than "read the documentation" which I already did or "read related posts" which I also did. That will stop it listening on the smtp port. It's the smtpd bit which is important. These will allow you to inject emails locally for forwarding, either through a unix domain socket or through the submission port.

This is all detailed in man 5 master. You are best to set up an mx host in DNS pointing to the source IP address, as many systems will reject emails if it does not exist. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Stack Gives Back Safety in numbers: crowdsourcing data on nefarious IP addresses.

Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually. Related Hot Network Questions.

Question feed. Server Fault works best with JavaScript enabled. Accept all cookies Customize settings. This setting defines the domains which emails Postfix accepts. Postfix accepts only incoming mails which are intended for the domains listed in this setting. If this setting is set to blank, postfix will not accept any incoming mail. This setting defines the local program which postfix uses to deliver the received mails. This setting defines the version of IP protocol which Postfix uses.

If your server does not use IPv6, you can set it to IPv4. This setting defines the list of networks that are allowed to use this email server. This setting provides a basic protection against email abuse. This setting limits Postfix to accept messages only from your trusty networks. Following table summarizes the settings which require in configuring a null client and a functional email server. If hostname in your system is set to different, please use that name instead of server. Postfix reads configuration file when it starts.

Whatever change we made in configuration file will not apply until postfix service is restarted. Default firewall configuration does not allow Postfix to receive incoming messages. Postfix uses smtp service to exchange messages with other email servers and hosts. In order to allow Postfix traffic, we have to add an allow rule in firewall for smtp service. Above commands will configure Postfix as a null client. To compose and send a mail directly from command prompt, type following and press enter.

On system1, use mail command to view the mails. You should see the test mail that has been sent from null client. Postfix is a powerful but easy-to-configure mail server. It is the default mail server in Red Hat Enterprise Linux 7. Postfix is provided by the postfix RPM package.