SPF Record in DNS
Almost all free mail providers like Gmail and Yahoo Mail will filter out spam or spoofed emails by validating the source (SMTP server), if your… Read More »SPF Record in DNS
Domain Name Server (DNS)
NameServer Persistency in Linux
/etc/resolv.conf When we want to change DNS permanently in Linux, what will you do? I guess you will modify /etc/resolv.conf. But newer versions of Linux… Read More »NameServer Persistency in Linux
How to Resolve "Could not open socket" From reCaptcha
If you met the following error from the browser, it could be a reCaptcha problem. Could not open socket It seems a DNS problem, you… Read More »How to Resolve "Could not open socket" From reCaptcha