Using the sendmail function to send an email through MATLAB - matlab

Question

I am trying to send an email, using the MATLAB sendmail function. I have been following the instructions of the sendmail function analysis in Mathworks on this link: https://uk.mathworks.com/help/matlab/import_export/sending-email.html
The code which I used on the command window is the following:
setpref ('Internet','E_mail','myemailaddress#gmail.com');
setpref ('Internet','SMTP_Server','smtp.gmail.com') ;
sendmail('emailofreceiver#gmail.com','texttobesent') ;
The message that I am getting after running those commands is the following:
Error using sendmail (line 169)
Could not connect to SMTP host: smtp.gmail.com, port: 25;
Connection timed out: connect
From what I understand I must change the arguments inside the second setpref function that I call, though I am not sure what exactly to include it them, based on the the gmail smtp port that is returned. Any help would be very much appreciated! Thank you in advance!

Answer 1

You may also need to set up something related to SSL. Try to add following besides SMTP_Username and SMTP_Password, and it should work for gmail:
props = java.lang.System.getProperties;
props.setProperty('mail.smtp.auth', 'true');
props.setProperty('mail.smtp.socketFactory.class', 'javax.net.ssl.SSLSocketFactory');
props.setProperty('mail.smtp.socketFactory.fallback', 'false');
props.setProperty('mail.smtp.socketFactory.port', '465');

Answer 2

As #Xiangru Li said on his answer, setting up related to SSL is indeed needed. But that was not enough. Eventually, I had to change my google settings to turn on access for less secure apps. Information about doing this can be found in this link: https://support.google.com/accounts/answer/6010255?hl=en
So after doing this, the following code was successful and I managed to send an email with it:
setpref('Internet','SMTP_Server','smtp.gmail.com');
setpref('Internet','E_mail','myemailaddress');
setpref('Internet','SMTP_Username','myusername');
setpref('Internet','SMTP_Password','mypassword');
props = java.lang.System.getProperties;
props.setProperty('mail.smtp.auth','true');
props.setProperty('mail.smtp.socketFactory.class','javax.net.ssl.SSLSocketFactory');
props.setProperty('mail.smtp.socketFactory.port','465');
sendmail('emailofreceiver','testtobesent') ;