How can I send HTML email?

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Is there a way to set the content type to HTML instead of text/plain? I've created my HTML message into a Var and I'm trying to send it via sendmail, but the message is not received as expected. The mail app is just showing the HTML code truncated as if it where a plain text mail. How can I fix the content-type header? Example:

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Cristian Urrutia il 27 Set 2016

Modificato: Cristian Urrutia il 27 Set 2016

Apri in MATLAB Online

I found this reference, but I don't know how to implement the content_type header: https://www.mathworks.com/matlabcentral/fileexchange/18351-send-mail/content/sendmail%20with%20jgmail%20class%20java%20package/docs_jgmail/com/messners/mail/MessagePart.html There's something like:

public MessagePart(java.lang.String name,
                 java.lang.String filename,
                 java.lang.String content_type,
                 java.lang.String encoding)

Cristian Urrutia il 27 Set 2016

Apri in MATLAB Online

This is the code occupied to send the mail:

title_mail='Mail title';
msg_mail=sprintf('<html>...</html>');
%atch_mail='';
mail = 'account@outlook.com'; %Outlook email address
password = 'password'; %Outlook password
setpref('Internet','E_mail',mail);
setpref('Internet','SMTP_Server','smtp-mail.outlook.com');
setpref('Internet','SMTP_Username',mail);
setpref('Internet','SMTP_Password',password);
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','587');
props.remove('mail.smtp.socketFactory.class');%outlook 587 starttls
props.setProperty('mail.smtp.starttls.enable', 'true' );%outlook 587 starttls
props.setProperty('java.lang.String.content_type','text/html')
sendmail('destination@gmail.com',title_mail,msg_mail);%,atch_mail);