In order to prevent users from maliciously sending spam, Netease and Shangyi have certain restrictions on the number of emails sent by users within a certain time range, as follows:

Netease enterprise mailbox: a single user can only send 1000 emails at most every day. A message can contain up to 500 recipient e-mail addresses.

Shangyi enterprise email: an IP can send up to 400 emails a minute. An email can have up to 200 email addresses. If an email contains 200 recipients' addresses, it can't exceed 2 in one minute at most; If a message has only one recipient address, you can't send more than six messages in one minute.