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Run Your Own Email Server on CentOS/RHEL – Postfix SMTP Server

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Setting up a basic Postfix SMTP server Set up Dovecot IMAP server and TLS encryption Create Virtual Mailboxes with PostfixAdmin Creating SPF and DKIM record to get through spam filters Setting up DMARC to protect your domain reputation How to Stop Your Emails From Being Marked as Spam How to Host Multiple Mail Domains in … Read more

Upgrade CentOS

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To upgrade all of your system software as well as their dependencies to the latest version, use this command: # yum update

Extend a partition with unallocated space CentOS 7

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Assuming your disk is /dev/sda and standard RHEL/CentOS partitioning: Extend partition Enter p to print your initial partition table. Enter d (delete) followed by 2 to delete the existing partition definition (partition 1 is usually /boot and partition 2 is usually the root partition). Enter n (new) followed by p (primary) followed by 2 to … Read more

Sample screenrc config file

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# Scrolling buff altscreen on caption always “%{= kG}%-Lw%{= kY} %n %t %{= kG}%+Lw%{= kc}” # Putty fix # term xterm termcapinfo xterm ti@:te@ defscrollback 100000 # Fancy vbell on vbell_msg “Wee~” hardstatus on hardstatus string ‘%{= kc}%H (%l) %-21=%{= .m}%D %d.%M.%Y %0c’ # Bind F11 and F12 (NOT F1 and F2) to previous and … Read more

How to disable IPv6 on CentOS / RHEL 7

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Disable IPv6 in kernel module (requires reboot) 1. Edit /etc/default/grub and add ipv6.disable=1 in line GRUB_CMDLINE_LINUX, e.g.: # cat /etc/default/grub GRUB_TIMEOUT=5 GRUB_DEFAULT=saved GRUB_DISABLE_SUBMENU=true GRUB_TERMINAL_OUTPUT=”console” GRUB_CMDLINE_LINUX=”ipv6.disable=1 crashkernel=auto rhgb quiet” GRUB_DISABLE_RECOVERY=”true” 2. Regenerate a GRUB configuration file and overwrite existing one: # grub2-mkconfig -o /boot/grub2/grub.cfg 3. Restart system and verify no line “inet6” in “ip addr show” … Read more

Get the multi-row tab bar back in Firefox

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github.com: MrOtherGuy/firefox-csshacks github.com: Aris-t2/CustomCSSforFx C:\Users\$user\AppData\Roaming\Comodo\IceDragon\Profiles\ $profile_name .default\chrome\userChrome.css C:\Users\$user\AppData\Roaming\Mozilla\Firefox\Profiles\$profile_name.default\chrome\ userChrome.css Sample userChrome.css for Firefox on Linux: sample userChrome.css for Firefox on Windows: