cant telnet to my mail server on ubuntu 14.04

Hi Everyone, i used this guide on order to built a mail server:

Now i have a few question please: 1)My actuall hostname is “armonico” and i want at the end to have a mail adress with different domain:, can i do it? mail server with differet name? 2)At the guide i stuck at the stage where i need to telnet “” I cant find any help or guide, Please Help Me!!

Thank You ALL!!!

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DigitalOcean blocks SMTP outings for new customers. This measure aims to prevent the abuse of mail services and SPAM. Open a support ticket and you can get all steps to solve this problem.