[Hilo]How can I send an e-mail formatted with HTML?

You must use the complex mode of AT+KSMTPUL and add a good content-type in the header of your e-mail. See the example below:

AT+KSMTPUL=0,87
+KSMTPUL: 11
CONNECT
Content-Type: text/html; charset=“iso-8859-1”;
This is the HTML body of the message.
OK

Please find in AT document “Appendix 9: How to Use Mail Specific commands” for more details.