Since yesterday, I am unable to delete emails using three different clients.  From the web portal all seems to be working fine but not from my mobile phone, or two different laptops.  I have been using the current setup and clients for many years and I have not changed anything.  When I delete an email it moves to the Trash folder but in a few seconds it returns back to the inbox.  I am using IPAM for all clients.  Also emails are received on the client an hour after they show up on the web portal, when it used to be a few seconds later.
Thank you for all your help in this matter.