New answers tagged pop3
Your Outlook mail client, as shown in your image: is not set to use SASL authentication. Outlook's "Outgoing Server" dialogue may not be self-explanatory: "Log on to incoming mail server before sending mail" means do not SASL authenticate, but POP first. However, your Postfix settings require SASL: smtpd_client_restrictions = permit_sasl_authenticated ...
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