Yes I have enabled Alert Mail in settings and notifications in profile, there was finally an error.
2018-02-23 3:47:32 - Error: RCPT TO not accepted from server!
2018-02-23 3:47:32 - Error: DATA not accepted from server!
2018-02-23 3:47:32 - Error: DATA not accepted from server!
2018-02-23 3:47:32 - Error: QUIT not accepted from server!
that was at the time of the order,
also all other email works.
Thank you.