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HOWTO: Protect against postfix AUTH DoS attacks

I have tons of /Oct 19 06:30:50 mail postfix/smtpd[14043]: connect from unknown[151.237.190.118] Oct 19 06:30:50 mail postfix/smtpd[14043]: lost co...

Mar 5, 2021

0 2158

Hardening guide for Postfix 2.x

Make sure the Postfix is running with non-root account: ps aux | grep postfix | grep -v '^root' Change permissions and ownership on the destinations...

Mar 5, 2021

0 2097

Lightweight, secure, database-free, spamfiltering mail server with Postfix, Dovecot, openDKIM and dspam on Debian 7

## Update 2016-03-08 I wasn’t aware Dovecot is case-sensitive by default and this led to strange situations. Many thanks to the entry Roundcube, Dov...

Mar 5, 2021

0 1911

handy commands

continuous live logging tail -f /var/log/mail.log show line number nano nano -c filename Ubuntu 14.04 System Logging sudo chown syslog:adm /var/log...

Ubuntu

Mar 5, 2021

0 2020

How To Configure Custom Postfix Bounce Messages

Since Postfix version 2.3, Postfix supports custom bounce messages. This guide shows how to configure custom Postfix bounce messages. I do not issue...

Mar 5, 2021

0 2164

Troubleshooting Problems with Postfix, Dovecot, and MySQL

This guide is a companion to the Postfix, Dovecot, and MySQL [1] installation guide. Because setting up a mail server is tricky, we’ve created this c...

Mar 5, 2021

0 2205

Diagnosing Network Issues with MTR

MTR is a powerful network diagnostic tool that enables administrators to diagnose and isolate networking errors and provide helpful reports of netwo...

Mar 5, 2021

0 2102

Check your DNS records with dig

Have you ever wanted to query the Domain Name System (DNS) to discover what information it holds about your domain? Do you have some important change...

Mar 5, 2021

0 2054

Nginx: Block URL Access (wp-admin/wp-login.php) To All Except One IP Address

am the small business owner and runs my own web-site. I have noticed increased cracking activity against by blog. What’s the best way to block WordPr...

Nginx Wordpress

Mar 5, 2021

0 3603

Postfix automated backup/secondary email server with Virtualmin

There are various guides online for setting up Postfix as a backup (hold and forward) mail server which knows which accounts are valid on the primary...

Virtualmin

Mar 5, 2021

0 3083

A Simple DNS-Based Approach for Blocking Web Advertising

Hal Pomeranz, Deer Run Associates Anybody who uses the Web these days has probably developed extremely good “mental filters” which allow them to igno...

Mar 5, 2021

0 1923

Creating a LXC virtual machine template (from scratch)

I have chosen to put all virtual machines in a /mnt/ vm folder, for which I’ve created a separate partition. Here I will put the virtual machine fil...

LXC

Mar 5, 2021

0 2233

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