If an e-mail warns you that your package can't be delivered, don't be so quick to open the attachment. It's probably a virus.
Vincent Owens, supervisor of customer service for the Jefferson City Postal Service, said the bogus e-mail is again making the rounds.
"I've gotten four calls since last Wednesday," he said. "We don't send e-mails to the general public. We don't have their e-mail addresses."
The postal service does offer tracking services that let you provide your e-mail, then get delivery status updates. But unsolicited e-mails that appear to come from the United States Postal Service (USPS) are from spammers, Owens said.
"The safest thing would be to delete it immediately and obviously not open the attachment," he said.
A USPS website warns that one such e-mail scam has in the subject line: "USPS Delivery Failure Notification."
It said the e-mail urges people to click on a link to find out when they can expect delivery. But the link activates a virus that can steal personal information such as user names, passwords or financial account information from computers.
A local UPS representative said the company hasn't heard about local customers with similar problems.