I saw a similar post, but it was a different issue.
I have an account configured as POP3. Deleting messages is set to Move to Deleted Folder first. I never delete from Aqua Mail anyway. And I pull messages from the server into Outlook, and then delete from the server then.
For one message yesterday morning and another yesterday evening, I received them in Aqua Mail, read them there, but they appear to have disappeared from the server. They never made it to Outlook. I read other messages in Aqua Mail, and they made it fine to Outlook, but these two disappeared. If I hadn't read them on my phone, I wouldn't know they were missing from Outlook.
Any thoughts?
Barry