Exact same problem, emails in Outlook just stopped working in the last 2 days.
Have to agree, previous responses from Virgin seem to be misdirection. Since we haven't changed settings, what benefit is there to checking them? Have Virgin checked? I mean it's not impossible Microsoft have changed something to wind up email recipients and providers alike... but I doubt it.
I'm sure some of the community responses are well intended, but they are clearly technobabble.
After a lot of frustration with trying to track down an answer on the main Virgin site, I found that it does not list example settings for a Blueyonder email address, making it impossible for me to actually check that my completely unaltered settings remain correct.
I tried instead to set up a new email account in Outlook, using the same email address and I think I may have stumbled upon the answer. It seems that Virgin may not support POP3 and SMTP any longer, or at least have messed about with them in the last couple of days, and instead now favour IMAP.
Good news, setting up the "new" account did work. Bad news, I now have 2 separate inboxes in Outlook which is not really the desired outcome. Not least because it is now struggling to download EVERY email I have received since Tony Blair was prime minister, this killed Outlook at around the 50000 mark and it only reached 2018.
Even trying to sign up here to whinge/contribute was frustrating as I had to click on an email link to verify my new account... tricky considering what my initial difficulties were, and it also being lost in the approximately 160000 emails being delivered. I went onto emails online to access it and found that Virgin had decided a Virgin email was in fact spam to add a further level of difficulty.
Perhaps the support pages could be updated to reflect what appears to be the issue here? Or that Virgin responses in this thread could acknowledge that issues in fact stem from the Virgin end instead of suggesting Outlook users themselves have decided to mess around with settings for no particular reason?
As is clear above, I have been with the same provider for longer than they have been called Virgin, and in the main it is not wanting to lose an email address I've had for almost quarter of a century that has stopped me changing service provider. But with tonight's experience, and several other concerns over the services offered and the ever increasing prices, I might just move to an email address that is not tied to an ISP and run the risk of losing access to every account I've ever created online and see if any other providers fancy taking my money instead.