bug creating mail account

Hello,

I have an other bug creating a new Mail account in OS Sierra 10.12.2

MBP 15" A1707 Touch Bar ; 2.9 GHz Intel Core i7

OS Sierra 10.12.2 (16C67)

account with mobile carrier, Bouygues telecom in France

The configuration to this account works with my iPhone 5s on iOS 9.3.5 and iPad iOS 9.1 using wi-fi

And this account did work on my old MBP mid-2012, OS X 10.9.5

Configuration :

User account : xxxx-alain4@bbox.fr

IMAP port : 993 (SSL) -> imap.bbox.fr

SMTP port: 587 (SSL) -> smtp.bbox.fr

Those values are given by Bouygues telecom

I have tried a few times without success, I always get the message : User and password are not recognised !

If ever IMAP works, SMTP connections get always errors.

I've tried with ThunderBird 45.6.0 -> same thing impossible to create the account...

PS: my amount with google at gmail.com works great!

Regards,

Alain.