@Doug12 wrote:
I’m accessing mail via an Apple mail on phone and iMac client and connection is set up through IMAP
So have you checked your Ntlworld email account using Virgin Media's Webmail service on their website to see if the missing emails are still there?
Sign in from this link https://mail2.virginmedia.com/ with your Ntlworld email address and password. Check the Trash folder there as well as the Inbox.
There are always a steady trickle of posts on this forum where people report that some of their VM emails have gone missing but it is rarely possible to determine what happened.
A quick online search for "Emails gone missing" will show that it is not unique to VM email. From time to time, users of Gmail, Outlook.com, Yahoo and others report similar experiences. It emphasises the need to back up emails and not rely on email apps and webmail services to store emails.
Whenever there are IMAP clients involved suspicion always falls on them. I know from personal experience it is all too easy to delete emails from your phone app without realising it.
Your experience of emails disappearing and then reappearing seems unusual, I remember someone experiencing that with MS Outlook and it was eventually tracked down a filter they had set up in Outlook. The emails were downloaded to Outlook but just not being displayed. I am not familiar with Apple Mail but I see that it also has a filter option to temporarily display only certain messages. It might be worth checking that.
Finally, you ask "wondering if there has been a server issue?" I am not a VM employee so cannot give a definite answer. All I can say is that I have a number of Ntlworld email accounts and I have not seen any emails go missing from them.
Sorry I cannot give you a more definite answer.
Coenoby
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