I am trying to set up my postfix using Gmail smtp relay server. I have set it up in other servers without issues, but I am having difficulty getting it to work in my work network.
I tested if there is a network blockage by using telnet smtp.gmail.com with ports 25, 587 and 465, and in all instances I successfully connect to the server (msg 220), but I get no more output, even when typing EHLO.
I also tried openssl as shown below, and I dont get any additional output other than "CONNECTED". What may be happening? Could this be the result of a network firewall rule?
$ openssl s_client -starttls smtp -ign_eof -crlf -connect smtp.gmail.com:587
CONNECTED(00000003)
