Email Issue

Hi All,

We are on 18.1. We had been using Email server in Appian for a while to send Emails out but now it is not working. To check the SMTP Server, when I used "telnet" following command

telnet server_name.mydomain.com 25

I got following result in window

220 servername SMTP Server (JAMES SMTP Server 2.2.0) ready Day, #1. Mmm yyyy hh:mm:ss -1200 (GMT-12:00)

Then I used "EHLO myemailaddress@companyname.com" and got the following message:

501 5.5.4 Invalid domain name [XXXXXXXXXXXXX.eop-XXXXX.prod.protection.outlook.com]

Can anyone guide where is the issue & how can I fix it?

Thanks in Advance

Rishu