I have two college mail accounts setup in Mail.app which are common in some mailing lists of my institute. When some message is sent over those, I get a notification, I click it and the message is displayed. Then I get one more notification which is of-course from "B" account, and I click the delete button and the already displayed message also disappears. The message is now not in any of the Inboxes.
What can I do to resolve this behaviour i.e. only one message should be deleted, not both? Because I get two notifications, they must be linked to each message, then why one notification deletes both messages?
I checked the trash folder (after a very long time) and was surprised to see no previously deleted mail of account A in the trash while there were, from account B. I checked the folder behaviour in the Mail.app preferences for junk and deleted mails and both of them had the same folder structure i.e. Inbox/Trash and Inbox/Junk. "Delete the mails" was set to "Never"
I checked on the webmail interface for the folder structure and I found the same but the issue is that:
Account B has all 3k+ deleted mails (including the one I just deleted) in the "Trash" but account A has 0 in the "Trash"(not even the one I just deleted) and some (old mails) in junk which I never got to read. Thankfully nothing important.
Some more clarification: Account A is a student account and account B is of the same privileges as that of a faculty (some extra quota and all).
As many people would know, special mailbox named "Today" lists all the messages one gets on the same date. Suppose a mail was sent to "all" list. I appears in my mailbox A (personal) and mailbox B (office use) both. But when I see in Today, I see only one message and deleting it from Today deletes from both inboxes.