Error using sendmail (line 172)

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Andy Andrianandraina
Andy Andrianandraina on 9 Nov 2015
Commented: Walter Roberson on 22 Sep 2018
Hello, Does someone can help me,
the fact is : I obtain the following error when using the function sendmail
Error using sendmail (line 172)
Could not connect to SMTP host:, port: 25;
Network is unreachable: connect
I am using matlab R2013b ( with windows 7 My computer is in a network using proxy and I already configure the proxy for matlab internet connection in preferences > Web > Internet connection. When I test the connection it marks Success! And the gmail that I use for login open when using firefox. Thanks in Advance Andy
Walter Roberson
Walter Roberson on 22 Sep 2018
riaz khan please create a new Question for that. When you do, post the complete error message.

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Answers (1)

Shruti Sapre
Shruti Sapre on 16 Nov 2015
Hi Andy,
MATLAB started using Java 7 from R2013b. Java 7 uses IPv6 by default.
Could you please try the below workaround:
1) At the command line, enter:
>> which -all java.opts
If it says "'java.opts' not found.", then proceed to step 2.
2) Go to your MATLAB startup directory. Create a file "java.opts" with the below one line:
3) Restart MATLAB, and try the "sendmail" function again.
If a "java.opts" file was already found in step 1, open that file. Copy and paste this line into that file:
Save the file, then restart MATLAB.
This will tell MATLAB's version of Java to use IPv4 for communication when possible.
Hope this helps!
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Andy Andrianandraina
Andy Andrianandraina on 17 Nov 2015
Hi Shruti Sapre, Thanks for your answer. Effectively there was no java.opts in my matlab but although I create the file in the bin directory the problem stays the same, I have the following error :
Error using sendmail (line 172)
Could not connect to SMTP host:, port: 25;
Permission denied: connect
Error in envoie_mail (line 76)
I think that the problem come from the proxy server here in my company :-( which does not allow sending mail using smtp, because I tried to launch the same program at home it worked perfectly. Wish you to have a nice day. Andy

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