mail to case no more working

mail to case no more working

Hi,
when i send normal emails to  support@esrifrance.zohosupport.com, zohosupport mail to case does no more work ( new case creation / append to existing case )  
It was working perfectly till a few weeks ago.
When my colleagues send normal emails to this adress, mail to case is working fine.

Can you help ? 
Has my email adress been blacklisted or trottled ?  

Thank you for your help
Regards
Eric