Hello, the email arrival notice of Unicom's mobile phone mailbox. How can SMS display the email content instead of the email link?

When logging in to the mailbox for the first time, you can set the arrival notification method through the wizard, or you can change it in the settings later. Setting method: after logging in to the email page, click "Settings"->; "Mail arrival notification". When a new email arrives, the system user sends an email arrival notification via SMS, including the sender and the email subject. After receiving the SMS email arrival reminder, the user can reply "A" directly, and the system will then send the email content to the user's mobile phone by SMS, sending 70 bytes at a time.