pSome internet access providers have port 25 disabled in their routers to prevent spam. If you run your own email server in a data center, you might have to enable the submission port (587) in postfix to be able to send emails from your local email client to your own mail server. Enable Submission Port ... Read more
You are using a Postfix mail server, and your system started sending masses of spam emails? The following guide will show you how to narrow down how spam is sent by inspecting emails in the mail queue. To use the postcat command in Postfix to find out who has sent an email that is currently ... Read more
This guide will show you step-by-step how to requeue emails in Postfix on Linux. I've been using these steps on my Debian and Ubuntu mail servers, but they should work on other Linux distributions like CentOS, Rocky Linux and AlmaLinux too. Requeue Email in Postfix Access the Linux System: Log in to the Linux system ... Read more
Getmail is a powerful email retrieval program for Ubuntu Linux that can be used to download and store emails from remote mail servers. It supports POP3, IMAP, and SDPS protocols, so you can configure it to work with your current email provider to download messages and store them on your local computer or server. Additionally, ... Read more
Rspamd is a widely used email and spam filtering solution. It consists of a set of rule-based filters, blacklists, greylisting, and also a self-learning Bayes filter. Sometimes, it might happen that the Bayes filter starts to behave oddly and flag the wrong emails. In such a case, you can either try to start passing the ... Read more
Make a backup of the old key and certificate file mv /etc/ssl/certs/dovecot.pem /etc/ssl/certs/dovecot.pem.old mv /etc/ssl/private/dovecot.key /etc/ssl/private/dovecot.key.old Create the new SSL certificate openssl genrsa -out /etc/ssl/private/dovecot.key 1024 openssl req -new -x509 -key /etc/ssl/private/dovecot.key -out /etc/ssl/certs/dovecot.pem -days 730 Restart Dovecot: service dovecot restart
More and more internet access providers are closing port 25 to reduce spam except for connections to their own mail servers. If you run your own email server and have problems connecting to it on port 25, you can enable port 465 (SMTPS) in postfix as a workaround. Edit the /etc/postfix/master.cf file: nano /etc/postfix/master.cf and ... Read more
There are three ways that an ISPConfig email user can use to change his email password (when he has no client login). Use the Mail user login in ISPConfig Email users can login to ISPConfig with their email address and mailbox password by using the normal ISPConfig GUI login. They will get logged into a ... Read more
Gmail is undoubtedly one of the most popular web-based email services today. One of the key factors that make Gmail so popular is its ease of use, which in turn is largely due to its user-friendly design and layout. While most of Gmail's features are easily accessible, the ability to save an email (or an ... Read more
Postfix provides several shell programs to manage the mail queue. These are: postsuper postqueue mailq In this tutorial, I will show you how to use these commands to manage the Postfix mail queue. Here are examples for common tasks: List all messages that are in the mail queue postqueue -p The output looks like this: ... Read more