Linux Tutorials on the topic “sendmail”

  • How to Install Radicale Calendar (CalDAV and CardDAV) on Ubuntu 20.04

    How to Install Radicale Calendar (CalDAV and CardDAV) on Ubuntu 20.04

    Author: Tags: , , Comments: 3Published: Sep 06, 2021

    Radicale is a free and open-source CalDAV (Calendars, to-do lists) and CardDav (contacts) server. In this tutorial, you will learn how to install and configure Radicale on Ubuntu 20.04.

  • Dockerizing LEMP Stack with Docker-Compose on Ubuntu

    ubuntu Author: Muhammad ArulTags: , , , Comments: 23

    In this tutorial, I will guide you step-by-step to use docker-compose to create a LEMP Stack environment (LEMP = Linux - Nginx - MySQL - PHP). We will run all components in different docker containers, we set up a Nginx container, PHP container, PHPMyAdmin container, and a MySQL/MariaDB container.

  • On sending emails, I get the following error message: "Relaying denied".

    apache Author: tillTags: , Comments: 0

    There are two solutions for this problem: 1) You configure your MTA to allow authentication via SMTP (SMTP-Auth). Your users then have to change settings in their email clients (e.g. Outlook), i.e., they have to activate Server requires authentication. 2) You install "POP-before-SMTP" or poprelayd on your server. Your users then have to fetch emails first before they are allowed to send emails for a restricted period of time (mostly 30 min.).

  • I cannot send and/or receive emails.

    apache Author: tillTags: , , Comments: 0

    Please check if Sendmail/Postfix and your POP3 daemon are running by executing netstat -tap You will get a list of all services listening on your server. If they are running re-configure your firewall (iptables or ipchains) so that the ports 25 (Sendmail/Postfix) and 110 (POP3) are not blocked. If this does not help please check that Sendmail/Postfix is really running on port 25 and your POP3 daemon on port 110. (Hint for standard RedHat installations: If you have webmin installed and are running Sendmail, go to Webmin->Servers->Sendmail->Sendmail Options. Under SMTP Port Options you often find the following entry:

  • How do I configure Sendmail for SMTP-Auth?

    apache Author: tillTags: Comments: 0

    Some helpful links: