Over the last week or so i have been getting invaid certificate errors on all my virgin email addresses using Mail on my apple macbook.
I googled the issue and it seems virgin had the same issue about 2 years ago which solved itself by virgin updating their certificates their end or something.
Can someone sort this as its very annoying having to keep accepting it and it also affects sending emails.
Its definitely not an issue my end as it also does this on my girlfriends virgin email address on her own macbook too using Mail.
See this recent thread, IMAP EMAILS CERTIFICATE INVALID, and if you are comfortable with using a terminal then you may wish to try JackLN's suggestion here; though make a backup before doing so.