I have been sending the same email everyday to colleagues for many years and recently when they try to open the email with a zip file attachment, containg Excel and PDF documents, Firefox warns ''This file contains a Virus or Malware''. It happens occasionally then goes away for a few days only to return a few days after that. I am using the same method for creation of the files contained, and I am using windows zip. Please help. AOL is my mail client as it is for the recipients I send this mail to every day, if that makes any difference. It only seems to happen in FF not in Edge or Google Chrome. Thank you in advance. Robert