Six emails in my SENT folder that I never sent, going to all letter/number recipient address
There is something definitely amiss in my email account. I just looked at my SENT folder and it shows six emails that I never sent. I am the only person with access to this account.
The recipient addresses as shown in the Sent mail summary pane are all extremely long strings of letters and numbers.
Two of them, both sent yesterday 9/11/16, start with the characters VE6C2HU.
Another two, sent on 9/10/16 went to an address starting with 8GITBEH.
On 8/22/16, two emails went to an address starting with 0109D7.
My Sent mail folder only goes back to May, but I am sure that I checked it during June and probably early July and no such emails had been sent at that time.
I have not clicked on these suspicious emails for content, but am very concerned.
I am very concerned that emails that I have legitimately sent to other people from my Zoho account may have been compromised in some way. My computer is completely up to date with antivirus, antimalware, and firewall protection on all fronts. If there is a problem I am 99.9% it is not originating from my machine.
What is going on with these not-sent-by-me emails? Anyone else reporting this issue?