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How to add a DKIM record to DNS?

Adding a DKIM record is more complicated than adding a SPF record because it needs to create a public/private key pairs and it also needs to install a DKIM software and configure your mail server to cooperate with the DKIM

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SPF record syntax

Although adding an SPF DNS record won’t cost you 1 minute, understanding the format of SPF record is not easy. The SPF record is a TXT DNS record you can add through your domain registrar. Some registrars will name this

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You don’t have permission to access /awstats/awstats.pl on this server.

I wrote a post on installing awstats on CentOS. That post actually teaches you to install awstats on CentOS 6, where you need to download the awstats package from sourceforge and install it and its dependent software manually. Today, I

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Migrate WordPress website from CentOS 6 to CentOS 7

The migration arises from the need for php 7 support. I must admit I’ve been successfully fooled by the versioning of php and CentOS. My old system is CentOS6 where only php5 is supported. I mean you cannot use “yum

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How to create symbolic link in Linux?

Although the command to create a symbolic link in Linux is very simple, I never remember it. Every time I need to create a soft(symbolic) link in CentOS, I have to search google for the answer. In fact, the linux

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how to setup a website on firebaseapp?

I want to share some pdf files on a free website. I do not want to buy a domain name. I do not want to buy a hosting space. I want to use a free space. I do not want

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How to recover WinSCP stored password?

When setting up a new site in WinSCP, you have the option to save your password so you won’t be prompted to input¬† a password to login the site. This is convenient in most cases except you want to retrieve

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What is the outlook smtp server?

As an outlook user, you have a outlook mailbox. When you configure your email client such as outlook, outlook express,etc., you will be asked to input a SMTP server. You should input smtp.live.com, port 587 here. This is the smtp

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How to use openssl to send email via SMTP server that supports starttls?

If you’ve read my article on how to use openssl to send emails, you may encounter some problem when applying that method to certain kind of SMTP servers such as outlook SMTP server. openssl s_client¬† -connect smtp.live.com:587 WARNING: can’t open

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How to filter packets belong to specific ip address in WireShark?

If you ask me what part of wireshark is the most difficult to learn, I would say it is the filter. Do you know how to filter packets belong to specific ip address? ip=xx.xx.xx.xx ipaddr=xx.xx.xx.xx ipaddress=xx.xx.xx.xx ip:xx.xx.xx.xx ipaddr:xx.xx.xx.xx ipaddress:xx.xx.xx.xx ip==xx.xx.xx.xx

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