I have a Debian 10 server which has postfix installed, each time I try to send outbound mail traffic, the server uses IPV6 over IPV4. This causes postfix to log Connection timed out.
I have tried sending packets to google SMTP server using telnet, whenever I run the command
telnet gmail-smtp-in.l.google.com 25 the terminal delays for some seconds and then outputs
Trying 2a00:1450:400c:c06::1a... Trying 220.127.116.11... telnet: Unable to connect to remote host: Connection timed out
Please I have no clue on what is happening.