Outgoing connections on port 25 / 587 / 143 blocked over IPv6?
I just moved my servers, including my mailserver to the new ams3 region because of ipv6. i configured postfix to use ipv6 and i recieved my first email over ipv6 without a problem.
But when i try to send mail over ipv6 to other mailserver that support ipv6 like gmail.com the connection times out.
I then used netcat to test it and found that three mail relevant ports seem to be blocked for outgoing connections. SSH works fine.
nc -vz [ipv6-address] 25
nc: connect to [ipv6-address] port 25 (tcp) failed: Connection timed out
nc -vz [ipv6-address] 587
nc: connect to [ipv6-address] port 587 (tcp) failed: Connection timed out
nc -vz [ipv6-address] 143
nc: connect to [ipv6-address] port 143 (tcp) failed: Connection timed out
nc -vz [ipv6-address] 22
Connection to [ipv6-address] 22 port [tcp/ssh] succeeded
Are these ports really blocked? If yes, why?
Hi there!
At LON1 location blocked too.
problem is blocked Port You VPS.
solved Problem Add Port Outbound Rules In Your VPS Firewall In Menu Network
Why would they intentionally cripple IPv6 outbound by default? IPv4 outbound to tcp/25 works fine by default. This makes no sense.