Send a simple mail including the value of a declared variable in the message

Good morning people! I am new in Arduino word and I am using with great success the EmailSender library. Thanks a lot for your work! Now I am not success trying to send the value of a variable obtained from the Esp8266 sketch using the simple email sender. (my project do not have SD support). I need to send a message with a welcome text (like your examples), but including the value of a variable from the sketch routine. Could someone help me? Thank you very much and have a nice time. Greetings. Mario