The envelope was addressed to Mike Seay, but the second line read "Daughter Killed in Car Crash," according to NBC 5 in Chicago.
Seay's 17-year-old daughter, Ashley, along with another teen was killed last April when their SUV veered off the road and crashed into a tree.
Seay posted the incident to Facebook, asking his friends how to handle it. He told NBC 5 he decided to contact the OfficeMax call center who told her "it was impossible."
When NBC 5 reached out to Naperville-based OfficeMax, the letter was blamed on a third-party mailing list provider. The corporate affairs office released a statement, apologizing to the family.
Read more at NBC 5.