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As forcer obliquely mentioned SMTP is for sending mail. And one of the most popular programs to do that is called "Sendmail." Not that you need to know that, but hey... Anyway to be able to send and receive email you need both an SMTP server and an incoming mail server that speaks either POP or IMAP. I won't go into Exchange here as it is Microsoft's own ...


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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