I have:
1) Centos server 1 with postfic/dovecot mail servers
IP1 45.45.45.45 (DNS: host1.com.ua)
server 1 cannot make outgoing request to 25 port because Internet Service Provider block it!
telnet alt2.gmail-smtp-in.l.google.com 25
Trying 173.194.71.27...
telnet: connect to address 173.194.71.27: Connection timed out
Trying 2a00:1450:4010:c04::1b...
telnet: connect to address 2a00:1450:4010:c04::1b: Network is unreachable
2) Centos server 2 (router)
IP2 93.93.93.93 DNS: (host2.com.ua)
server 2 can make outgoig request to 25 port
telnet alt2.gmail-smtp-in.l.google.com 25
Trying 74.125.193.26...
Connected to alt2.gmail-smtp-in.l.google.com.
Escape character is '^]'.
220 mx.google.com ESMTP ij4si32339564igb.9 - gsmtp
Question:
How do I set routing (tunneling/forwarding) to make all outgoing requests from server 1 port 25 through server 2?