Enviroment:

Exchange 2010, 2013 which only have hub role and other roles

1.

we should use the followign code to triggle sending mail script:

2.

we should use the following commands to Telnet the server to do the test:

I summarize the following commands:

telnet mail.sunet.net 25

HELO mail.sunet.net
auth login

Test

test123

MAIL FROM:<sunet@sunet.net>

RCPT TO:<sunet@sunet.net>
DATA
hello world.

3.

Using the following method to overcome the "504 5.7.4 Unrecognized authentication type"

we should change the authentication method:

And also, we need to use the port 25 as the smtp server

4.

It should be works at then.