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.