提交pp后收到邮件 求问大家！！

昨天提交的pp申请 刚刚看到uscis界面显示

we received your request for premium-processing of your Form I-129, Petition for a Nonimmigrant Worker, Receipt Number EAC19161xxxxx, and mailed you a receipt notice. Your premium-processing receipt notice contains contact information for direct inquiries on your case. Please follow the instructions in the notice. If you move, contact the premium-processing unit directly to update your address.

同时收到了一份邮件 很奇怪的内容 显示case status是initial review 下面内容是

During this step, USCIS initiates the background checks of the applicant/petitioner and identifies issues that may need to be addressed either during an interview or by asking the applicant/petitioner to submit additional information or documentation. USCIS reviews the applicant's/petitioner's criminal history, determines if there are national security concerns that need to be addressed, and reviews the application/petition for fraud indicators...

这个是要求ref的意思吗 请问提交了pp的同学们 之后有收到类似这样的邮件吗 十分感谢同学们的建议 T_T

补充内容 (2019-6-22 23:25):
APPROVE了 感谢解答的同学们
大家收到类似邮件不要慌 是系统邮件 表示USCIS收到了PP Request
希望还在焦急等待的同学们都尽早收到好消息~~