
postfix
postfix no local interface found SASL authentication no mechanism available Postfix Delete Mails from a user install postfix from source

Configure postfix to relay mails using SendGrid
To use postfix to send email using sendgrid, you first you need to install postfix on your server. Edit main.cf

spam
http://www.mail-tester.com/ https://glockapps.com/ https://www.mailchannels.com – used by hosting providers to stop outgoing spam. DMARC grscripts.com – ASSP based plugin for cpanel

fping
fping can be used to ping multiple IP and get report. If you just want to show if hosts are

DirectAdmin CustomBuild versions.txt is getting old
I got following email from DirectAdmin server. New Message: CustomBuild versions.txt is getting old on s1.serverok.in A new message or

postfix no local interface found
When starting postfix it failed with following error To fix, edit /etc/postfix/main.cf Find Replace with See postfix

subprocess installed post-installation script returned error
When installing software on Ubuntu, i get following error. To fix this, run Replace PACKAGE_NAME_HERE with actual package that fail.

cdn
https://aws.amazon.com/cloudfront/ https://bunny.net/ https://www.fastly.com StackPath CDN https://www.keycdn.com https://www.5centscdn.net – $50 per month for 3 TB Traffic. Used by safaritvchannel.com for video

update-alternatives
Set default editor in Ubuntu To change vi editor run To display current vi config, run

tmux
CTRL+B % Split window vertically CTRL+B “ Split window horizontally CTRL+B c Create new window CTRL+B d Detach tmux session

apt doesn’t support architecture i386
After adding facebook hhvm repository on Ubuntu 16.04, i get following error when running “apt update” command. This is fixed

add-apt-repository
add-apt-repository command can be used to add repository in ubuntu. To install, run Example