My wife uses a virginmedia.com email account accessed using either webmail on a laptop, or outlook on her phone.
She hasn't received any emails since early last week. She can still access her account on both devices. Emails sent from the account show as sent but don't arrive. Similarly, emails sent to it show as sent, and no delivery failures appear.
She's reinstalled outlook on her phone and signed in again, but still the most recent email is last Tuesday.
Mine has done this for an hour or two before fuel to signal issues, but never for a week, so I'm slightly lost.