Postfix SMTP server issue

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http://serverfault.com – So I have an Ubuntu Linux box machine for my website. (not ran locally at home, it is a public linux box). But for some strange reason I can only send Email from my home machine to this box in outlook. If I am on a different IP/Carrier I recieve a connection refused when I telnet. OUTSIDE House $ telnet allocatethis.com 25 Trying telnet: Unable to connect to remote host: Connection refused Inside House $ telnet allocatethis.com 25 Trying Connected to www.AllocateThis.com. Escape character is '^]'. 220 ALLOCATETHIS-L101 ESMTP Postfix powered by Easy Hosting (HowTos)