Why does the email sent to others by QQ mailbox become spam in others?

Hello, landlord: this is the setting of the other party's mailbox. Each mailbox has a different function. If the other person uses QQ email, you can ask him to directly whitelist you. You will receive all the emails you send him. Set the mailbox whitelist. In the blue "Settings" in the upper left corner of QQ mailbox, select the "Anti-Spam" function. The function of setting the "white list" is: ...

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