There are multiple an address might be considered non-standard.  Some of the most common:

1.  The address is located in a new subdivision, on a new street, or in a new building.
2.  The person living at the address has opened a PO Box.  In this case, the home address becomes non-standard and the PO Box is standard.
3.  The apartment number or house number falls out of the numeric range established for that street or is missing.
4.  The street direction is incorrect.

If you have any questions, please contact Click2Mail Customer Support at  866-665-2787 or [email protected].  Our hours of operation are Monday - Friday, 9 AM to 8 PM Eastern.