One of my customers called this week. He received a link for a bill he was asked to pay immediately.
Malware embedded in a zip file was attached to the email. The message was not Was not flagged as spam in his webmail application.
It is unusual for this type of email content to go undetected, it is possible though, especially when it is a new type of threat.
Spam systems rely on intelligence from previously reported email messages. These applications, use a data bank of previously learned data to check each incoming message, in order to learn and assess threats There is no 100% reliable system. It’s a matter of doing the best it can to combat threats.
At the end of the day, the end user, (you) need to take some responsibility.
The golden rule is always be wary. If you are sent suspicious messages, especially if they contain dodgy links or attachments. You need to assess and not trust the spam / malware filtering. If in doubt delete the message or mark it as spam (or both) Spam detection systems eventually catch up and these messages will go away.
Remember also , if someone is sending you an invoice There is a fair chance you would remember purchasing a product or service from them.
I hope this is useful to you If you nee more information on how to protect yourself, please contact me.