WC 5745 and SMTP problem

Hello,

i have 2 WC 7125 and 2 WC 5745.

i'm using the scan 2 mail feature on the 7125 with no problem:

mail server host: mail.jallatte.fr

SMTP port: 587

Communication SMTP - SSL / TLS: STARTTLS

Everything works fine on the WC 7125

In the WC 5745, unfortunately i don't have the possibility to select any communication type, so not possible to add the STARTTLS parameter. the Scan 2 mail is not working. i called the company managing our exchange 2013 server, they say they can't change anything for security reason.

the WC 5745 firmware is the latest i can find:  

061.132.221.21403

This is my settings:

http://i.imgur.com/eiYM9Rq.jpg

some help would be apreciated, actualy we can't use the Scan2Mail feature on these copier...