It looks like in MATLAB 2019 you need to set ‘E_mail’ property, in addition to what you mentioned above:

setpref('Internet', 'E_mail' , username);

Otherwise MATLAB gives the next error:

Error using sendmail (line 65)
Could not determine FROM address.  You can set one like this:
setpref('Internet','E_mail','username@example.com');

@Muhammad – you can use this feature to send text messages as long as your phone operator supports an email-to-text feature. You need to contact your operator to find out the specific details.

As far as I know WhatsApp does not enable outside programs to communicate with it, and has no plans to do so in the near future.

Secondly Is there any possibility available to communicate with WhatsApp via Matlab

Thanks

@Andreea – yes it is possible, all you need to do is to provide the correct SMTP information (IP address, port number, username, password)