I carry my laptop to other location, and the script works.

Per your suggestion, I put the error handling and still do not see any error.

Here is Sendmail log. 

Aug  8 08:59:00 MacBook.local postfix/smtp[15911]: warning: 30A5F1C79A
+1F: defer service failure
Aug  8 08:59:00 MacBook.local postfix/smtp[15911]: 30A5F1C79A1F: to=<s
+oni.nimesh@gmail.com>, relay=none, delay=260447, delays=260356/0.06/9
+0/0, dsn=4.4.1, status=deferred (connect to alt2.gmail-smtp-in.l.goog
+le.com[74.125.136.26]:25: Operation timed out)

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In reply to Re^2: Sendmail issue by arete
in thread Sendmail issue by arete

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