no, sorry, I send via smtp !

the fact is : there is no error !
I'm not sure to understand your question.
Feng office is on one server o2switch, and the mailserver that causes problems for sending is on another from ovh
(I have others mail accounts, on the same server as Feng office, which have no problem!)
Was it what you meant?
thank you for your help!
(PS: sorry for my english, or not to all understand first, I'm french

)