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The Internet Engineering Task Force (IETF) defines that in a proper RFC, the RFC 6154. There you will find a list of special use mailbox denominations: \All This mailbox presents all messages in the user's message store. Implementations MAY omit some messages, such as, perhaps, those in \Trash and \Junk. When this special use is ...


Mail app has a weird tendency to mix SMTP servers, which may be the cause of your issue. Open Mail.app, go to Preferences > Accounts and select one of your accounts. Look for the "Outgoing Mail Server (SMTP):" dropdown; click on it and then on "Edit SMTP server list". Delete all SMTP servers that don't correspond to the accounts that you're trying to ...

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