Not able to test via TELNET, new install

Hi guys.
I'm exploring PMG to replace MailCleaner, I'm trilled !!

My initial test was creating NDR, so I did further tests with telnet and here is my setup.

I'm filtering mail for many domains (incoming) that need to be delivered to different mail servers I run, so I enter nothing in PMG > CONFIGURE > MAIL PROXY > RELAYING > DEFAULT RELAY, and I left the port to 25.
I entered no domain in PMG > CONFIGURE > MAIL PROXY > RELAY DOMAINS.
I left port external to 25 and internal to 26.
I...

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