139 why can't I get the mail arrival notice sometimes?

There are usually two reasons why you can't receive mail arrival notification:

(1) The system is busy;

(2) The mail arrival time exceeds the set receiving time.

Suggested solution:

(1) login? Settings? Mail arrival notification? Check? Mobile phone reception time? .

(2) if not? Mobile phone reception time? Question, I suggest you consult the customer service hotline 10086.