Coding Notes

In case your postfix is not able to send mails to gmail accounts due to a IPv6 PTR failure, you are adviced to adhere to IPv4 in Postfix. edit  /etc/postfix/main.cf , and set  inet_protocols  to  ipv4 , inet_protocols = ipv4 You should restart postfix.

In case your whatsapp for windows is stuck in fullscreen, close Whatsapp and open the following file. C:\Users\ username \AppData\Roaming\WhatsApp\settings.json where username is your login ID in windows. The file can be opened with Notepad or any text editor. Change "isFullScreen":true to "isFullScreen":false Save the file and start WhatsApp. Now you can change the size of the window. (If required, you can change the size of whatsapp window from the json file too.