I have had a look at your past posts on this subject in December last year and the action that the Forum Team took:
https://community.virginmedia.com/t5/Email/Email-gone-All-of-it/m-p/3887739#M166248
The trail ends with a post from Jen_A asking you to reply to a PM. There is no evidence in that thread that you did so, but, course, you may have done so and had it replied to. But Jen_A would usually posted something about how the issue was concluded. And she hasn't. So as far as I can tell from your public posts the trail has gone cold. So we can't see what transpired. That is why the Forum will reprimand users for communicating about things via PM rather than using the public forum. Transparency and tracing are essential part of how this Community works.
Sensibly @John_GS has asked if you have changed your details. Presumably your password and security questions. But I think you'll think that this doesn't go far enough at this stage to resolve your issue. So let us see what further advice a member of the Community can offer.
There are several possibilities.
First of all a straight e-mail hijacking. In which case you need to follow the standard advice we give to all who appear to be experiencing this - the most crucial element of which is to check your web mail for any forwarding or filtering rules you didn't create and remove them:
https://www.virginmedia.com/help/virgin-media-mail-my-email-has-been-hacked
In addition you might wish to change your password again as John_GS has suggested. You must never reuse a previous password or use one that is similar to the one you have just discarded.
Second you are victim of spoofing. In which case there is little you can do until the attack passes:
https://community.virginmedia.com/t5/Email/Email-Spoofing/td-p/2941294
Now we can tell the difference between spoofing and hijacking but it is technically complicated to do so - we'd have to look at the e-mail headers of the e-mail concerned. I don't want to go there yet until we have eliminated or worked on the basics. But I am asking John_GS to have a look at the e-mail logs for your e-mail address to see if he can detect anything unusual. He'll need your e-mail address. You will be asked for it by PM. Do not send him any PMs until he asks (or you'll get your wrists slapped again!)
You've tackled the obvious issue of a malware infection. But please remember that there have recently been disclosed some massive leaks of of personal data from web sites you may have visited, disclosing all sorts of personal information. And some of your recipients may have had hijacking issues of their own which have lead to the disclosure of your information.
I've given you some more lines of thought to pursue. Let us know how you get on.
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