Show all Mailboxes together
When using multiple mail adresses each address must be selected in the drop down menu, and only one can be seen at once.
Allow the user to switch to a "full view" where all folders of all accounts are listed, just as desktop clients like Thunderbird do.
1
vote
Anonymous
shared this idea
WebMail Pro offers Unified Inbox feature which sounds quite close to what you’re looking for:
https://afterlogic.com/docs/webmail-pro/configuring-webmail/unified-inbox
It only works for account inboxes, dealing with all the folders of all the accounts isn’t technically feasible.