email being marked as spam when it isn't

[REDACTED]

Hi everyone.

I've had a couple of emails arrive from ebay@eBay.co.uk which have been tagged with [spam] in the header.  These were not tagged by the mail checker at my host as they have checked at their end AND they tag with ***[spam]*** (i.e. with the three *).

I've just checked and now emails from other valid sites such as Expedia are being tagged as well.
 
Why has this started happening and how do I stop it?

This is within Outlook for Mac, running Avast program version 12.5.2ac865de9f01

MTIA

Leon Loberman

[tumic]

Avast does not modify the subject of emails. All it does with the headers (additionally to deleting* the infected attachments) is adding two extra headers:

• X-Antivirus (containing the VPS version)
• X-Antivirus-Status (either clean, infected or not-tested)

* on the client, the emails on the server are never modified.