Postfix timeout after DATA (0 bytes) on either smtp or submission port
3 Aug 2022
10:21 am
If you get the following error in your Postfix log file, and email clients just appear to be hanging (e.g. stuff in Outbox): Aug 3
Knowledgebase
How to send a test message using Linked-In lead generation
21 Jun 2022
9:50 pm
Steps Create an ad Link it to a lead generation form Once you’re done, this is the menu to send a test message: Linked-In
GitHub Cheat Sheet
15 Jun 2022
8:19 am
How to make an URL using GitHub Markdown Markdown syntax for a hyperlink is square brackets followed by parentheses. The square brackets hold the text,
Unable to restart FirewallD – Found left-over process 1234567 (rmmod)
14 Jun 2022
9:15 am
To restart FirewallD, use this command: service firewalld restart However, if FirewallD refuses to restart, and you check the status using this command: service firewalld
Tip for Installing Packages on OpenSUSE
12 Jun 2022
12:41 pm
Here are some tips, tricks, and traps when working openSUSE How to install Software There’s no apt or yum, so use zypper. Here is an
How to block and and unblock IP addresses using FirewallD
4 Aug 2022
What is FirewallD? FirewallD (Firewall Daemon) is a nice alternative to iptables but still uses iptables behind the scenes. Yet it’s much simpler and easier
Postfix timeout after DATA (0 bytes) on either smtp or submission port
3 Aug 2022
If you get the following error in your Postfix log file, and email clients just appear to be hanging (e.g. stuff in Outbox): Aug 3
How to install Kopano Groupware from scratch on Ubuntu – 2022 Guide
1 Aug 2022
Background Kopano is a wonderful groupware application that can fit nicely as a nice intermediate groupware solution between traditional shared hosting IMAP/POP3 mailboxes, and full
How to set the timezone in Ubuntu and CentOS and some other useful time commands
1 Aug 2022
To set the timezone in CentOS or Ubuntu, see examples below: timedatectl set-timezone Europe/London timedatectl set-timezone Africa/Johannesburg For a list of zones, use these commands:
How does SPF and DKIM work?
12 Jul 2022
SPF SPF records can be added easily by just adding a new TXT record to DNS. But how does the syntax for an SPF record