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I have configured sSMTP on Ubuntu and it worked fine yesterday. But today when I am trying to send email it shows "ssmtp: Cannot open smtp.gmail.com:587" error message.

$ apt-get install ssmtp  

$ vi /etc/ssmtp/ssmtp.conf
root=sender.email@gmail.com
mailhub=smtp.gmail.com:587
rewriteDomain=
hostname=mycomputerName
UseTLS=YES
UseSTARTTLS=YES
AuthMethod=LOGIN
AuthUser=sender.email@gmail.com
AuthPass=sender.email.password
FromLineOverride=YES

$ chmod 640 /etc/ssmtp/ssmtp.conf

$ ssmtp username@gmail.com
Hi
Ctrl+D
ssmtp: Cannot open smtp.gmail.com:587

Additional info: Yesterday I used public IP, today I am using private IP. I think it is not any problem.

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1  
Your machine can't connect to smtp.gmail.com on port 587, so something must be blocking it. Check any firewalls on the machine or between the machine and the Internet. –  mgorven Aug 9 '12 at 5:33

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