Reusing the connection is established with google script app google and google spreadsheets, they have conducted tests of electronic mail sent availing the services of google.
Important note :
To understand in detail the mode of operation of the connection between esp8266 and Google App Script first see the following posts, since the Library uses HTTPSRedirect created by Sujay Phadke (electronicsguy) thanks for their contribution to the community ESP,
1. ESP8266 program with Arduino IDE in 5 minutes
2. ESP8266 direct connection to Google Spreadsheets (Google Docs)
Informative note :
It should be noted that these services must have a gmail daily limit, both email and Script execution, this note is purely informative.
Informative Dashboard for Google accounts.
https://www.google.com/settings/dashboard?hl=es-419
http://www.google.com/appsstatus#hl=es&v=status
Arduino IDE Code
download code at the end of post
Code Google Script App
Make reading parameters from ESP8266 and makes sending email.
download code at the end of post
Google Spreadsheets
Template Verification, Google script reads cells A2, B2, C2 and D2 There must come from ESP8266 parameters.
Terminal Serial ESP8266
Initially, the module makes connection to the network, performs verification certificate, Send POST data.
It has created a counter to prevent uncontrolled mails sent when the counter is equal to 10 can make the shipment.
Mail from Receiver
Currently I have only tested emails to gmail, but should work to any mail server.