Previously when I deleted emials from my account while on my computer they would automatically delete from my iPhone and iPad, that does not happen anymore. How do I get this to happen again?
What client are you using on the pc? Outlook or Thunderbird or something like that? Window Mail 10? Is the account enabled in it using IMAP? If all three devices are using IMAP then everything should be synced, and if you delete a message on any of them, it should be deleted from all of them.