Pitney Bowes is blaming the disruption on a "malware attack that encrypted information on some systems," which matches how ransomware infections generally operate.

"Our technical team is working to restore the affected systems, and it is working closely with third-party consultants to address this matter. We are considering all options to expedite this process," the US-based company said in a statement on Monday.

The company, which has over 1 million business clients, is perhaps best known for its postage meters, which can basically stamp a package for you. According to Pitney Bowes, the company's postage meters continue to function, but the attack is preventing clients from refilling their funds to print out more postage.

As a result, some users have taken to social media to post images of their postage machines suffering from IT errors. Access to the Pitney Bowes' Send Pro Online service in the UK and Canada is also currently down.

In addition, the same attack has hit the company's "presort" mail cataloging service for USPS. However, the US Postal Service is closed today due to the Columbus Day federal holiday, so it remains unclear whether the disruption will delay mail deliveries countrywide. USPS didn't immediately respond to a request for comment.

Pitney Bowes is declining to elaborate on the attack and if the hackers behind the disruption are demanding a ransom. But there's some good news. "At this time, the company has seen no evidence that customer or employee data has been improperly accessed," the shipping provider said in Monday's statement. The company's "cross border" shipping systems also remain unaffected.

Read more here: https://www.pcmag.com/news/371309/postage-provider-pitney-bowes-hit-in-apparent-ransomware-att