In the (continuing) absence of any support from BD Support, I asked eBay Support if they knew of problems with BD affecting their e-mails to customers, some of which are legally binding, e.g. agreements to sell or purchase.
Unlike BD, they replied promptly and asked a few questions to which I replied:
"It was definitely not Outlook at fault because:
(a) I have only 2 blocked senders logged in Outlook and neither of them are eBay e-addresses;
(
After I had uninstalled BitDefender the problem went away without making any changes to Outlook.
Yesterday, I changed my eBay contact address 5 times: twice with BitDefender installed, once with BitDefender installed but with its anti-spam module disabled; and twice with BitDefender uninstalled. Only in the latter two cases did the eBay e-mails generated by my changing my e-address arrive in my Inbox; in each of the three other cases they were buried in a Spam sub-folder of Deleted.
Thus I am fairly convinced that this unwanted behaviour is caused by BitDefender, who have not troubled to reply to me yet."
Has anyone else encountered this problem or similar? Can BD v.10 be installed and run without the antispam module?