---
title: "Blog posts"
description: "Mailmum.IO blog posts for mail admins and admins in general. Subscribe to get updates."
url: "https://mailmum.io/posts/"
---

# Blog posts

Mailmum.IO blog posts for mail admins and admins in general. Subscribe to get updates.

- [Howto Block the Spamhaus DROP Lists with ufw](https://mailmum.io/posts/howto-block-spamhaus-drop-lists-with-ufw/): Block the Spamhaus Do Not Route Or Peer (DROP) lists on a Linux server with ufw, ipset, and a small update script that keeps the data fresh.
- [Howto Block Google Groups Spam in Rspamd](https://mailmum.io/posts/howto-block-google-groups-spam-in-rspamd/): Stop spammers abusing Google Groups as a delivery vehicle by adding a small Rspamd Lua rule that reliably detects the X-Google-Group-Id header.
- [Howto block mailservers using uncommon TLDs in hostname through Postfix](https://mailmum.io/posts/howto-block-mailservers-using-uncommon-tlds-in-hostname-through-postfix/): Block mail servers using uncommon TLDs in their hostname to stop spam/junk, phishing and other unwanted emails.
- [Howto Block Entire TLDs in Postfix](https://mailmum.io/posts/howto-block-entire-tlds-in-postfix/): Block entire TLDs in Postfix mail server to reduce spam, phishing and, other unwanted emails.
- [Sending Test Emails from Shell](https://mailmum.io/posts/sending-test-emails-from-shell/): Sending test emails from shell using command mail and mutt, adding content and even attachments.
- [Monitoring your Local Postfix Blacklist with Munin](https://mailmum.io/posts/monitoring-your-local-postfix-blacklist-with-munin/): Install, setup, and customize the Postfix RBL Munin plugin to monitor public blacklists and your self-built local blacklist. Compare the results visually.
- [Manage Postfix Mail Server Queues like a Pro](https://mailmum.io/posts/manage-postfix-mail-server-queues/): Understand and manage Postfix email queues like a pro, with examples to fill up queues for better understanding and practice.
- [Blacklisting Single Hosts, IP Addresses, and even Networks in Postfix](https://mailmum.io/posts/blacklisting-single-hosts-ip-addresses-and-even-networks-in-postfix/): Setup blacklisting single hosts, IP addresses or even whole networks for Postfix. Includes a whitelisting solution.
- [Whitelisting single Hosts, IP Addresses, and even Networks in Postfix](https://mailmum.io/posts/whitelisting-hosts-ip-addresses-and-even-networks-in-postfix/): Whitelist single Hosts, IP addresses, and even networks in Postfix to stop them hitting a blacklist.
- [Monitoring Postfix Email Queue and add Push Notifications](https://mailmum.io/posts/monitoring-postfix-email-queue-with-push-notifications/): Understand and monitor Postfix email queue through simple shell scripts. Customize it and add push notifications to your favorite smartphone.
- [DNS flag day 2020](https://mailmum.io/posts/dns-flag-day-2020/): Be prepared for DNS flag day 2020. Check your DNS systems!
- [Howto customize Roundcube webmail for your service](https://mailmum.io/posts/howto-customize-roundcube-webmail-for-your-service/): Customize your Roundcube webmail installation with logo, support URL and other details to make your service more professional.
- [Certbot: renewing all Let's Encrypt certificates](https://mailmum.io/posts/certbot-renewing-all-lets-encrypt-certificates/): Force renew certbot managed Let's Encrypt certificates - especially all certificates at once.
- [MailMum Project Started](https://mailmum.io/posts/project-page-started/): MailMum project officially started on 2020-01-03. It was born out of an internal project.