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Yes, nobody want spammers to use their SMPT server so usually only users at the own network is allowed to use the server.
If you use another ISP in denmark you can most of the time use their SMTP server. Some ISPs have restrictions at that too, e.g. the sender's email is not their email adresses. (different domain or your US email domain)
Another solution is to have a PW or pop mail (receive mail) before able to send as an authentication. The latter is the method I use at Phuket-Info.com server. So I can receive and send emails from anywhere in the world without troble.
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