When I execute this script from my house (Comcast internet connection) is does not work.
...
The same script works if I am at other location, other than my house.

Natural conclusion: the problem is with your house, or more specifically your "Comcast internet connection". Contact your ISP and ask if they prohibit outbound SMTP traffic other than via their mailservers. I bet you a beer that their answer will be "yes".

In reply to Re: Sendmail issue by hippo
in thread Sendmail issue by arete

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