Sending I-751. Ordinary mail?

[aquarius17]

When I send in my I-751, I assume I send it regular mail since it's going to a P.O. Box?

There's no way to send it certified mail, correct?

It would be nice to know that it has been received.. but seems like you just have to trust the postal service?

[knowledgeable]

United States Postal Service ...

... is very honorable, dependable and trustworthy. All letters like immigration, tax returns and even the green cards are sent via USPS and they reach the recipient correctly.

You should trust USPS.

Sure, you can send via Certified Mail to a PO Box.

Take care.