I have work over the version at_v0.20 and I added this command to get access to smtp with ssl .. like gmail security...
you must use like the AT+CIPSTART but only accept the ip address directly (smtp of gmail = 64.233.186.108 ), not the name of smtp like smtp.gmail.com ....
the port you have to use is as you want... (smtp gmail port = 465)....
With this you have a security connection with ssl ....
I attached this binary ...if someone need the source please say it..
thanks for all effort ..
Asimov